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Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

  1. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,195
    09-30-2005, 09:44 AM Go to last post
  1. Question Normal Distribution

    Assume x has a normal distribution, and find the indicated probability. The mean is 200, standard deviation 50. Find the following probability: ...

    Started by mayday‎, 04-08-2006 12:28 PM
    • Replies: 3
    • Views: 3,404
    04-08-2006, 02:59 PM Go to last post
  2. Normal Distribution

    How to find a Mean of a specified area (eg Area right side of the mean of distribution) in the normal distribution? Is there any way to do that?

    Started by pgvetrivel‎, 05-24-2008 05:32 AM
    • Replies: 1
    • Views: 2,316
    05-24-2008, 11:46 AM Go to last post
  3. Normal Distribution

    An individuals’ heights are normally distributed with mean 70 and standard deviation 3 (inches). a) What proportion of the population is...

    Started by SmileAli‎, 04-23-2010 05:16 PM
    • Replies: 4
    • Views: 10,961
    04-24-2010, 01:34 AM Go to last post
  4. Normal Distribution

    The time for symptoms of fire blight to develop in apple seedlings maintained at a temperature of 25C is normally distributed with a mean of 7 days...

    Started by ang6705‎, 09-28-2010 09:48 PM
    • Replies: 1
    • Views: 3,070
    09-28-2010, 11:36 PM Go to last post
  5. Question Normal Distribution

    Hi all, I need some urgent help with the below questions: 1. Sales of apples are normally distributed with a mean of 500,000 boxes per week and a...

    Started by shyam.uthaman‎, 08-13-2012 08:44 AM
    • Replies: 2
    • Views: 1,193
    08-13-2012, 08:59 AM Go to last post
  6. Normal Distribution

    Suppose that in an apartment building run by the Probandstat rental company, the inhabitants's weights follow a normal distribution with mean 73.0...

    Started by adnan86‎, 12-13-2015 09:36 AM
    normal distribution, probability
    • Replies: 1
    • Views: 1,013
    12-13-2015, 12:10 PM Go to last post
  7. Normal distribution

    Hi all, I'm generating a random normal distribution and i don't control the mu and sigma (its a matlab function that i need to use because the...

    Started by Evyatar‎, 04-25-2016 09:10 AM
    mean 1, normal distribution, random, sigma, std
    • Replies: 2
    • Views: 1,164
    04-26-2016, 01:31 AM Go to last post
  8. Smile Normal Distribution

    Assuming that the number of marks scored by a candidate is normally distributed, find the mean and the standard deviation, if the number of first...

    Started by wajeeha yasin‎, 12-31-2016 09:29 AM
    probability, statisics
    • Replies: 1
    • Views: 2,337
    12-31-2016, 09:36 AM Go to last post
  9. Normal Distribution & possible Standard Deviation error

    I have collected final sales data for over 12,000 sales of a single particular item. The prices range from $0.01 to a little over $4.00. I calculate...

    Started by derreckn‎, 02-18-2011 04:19 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 8,501
    02-23-2011, 09:10 AM Go to last post
  10. normal distribution ...help?

    Can Someone please help me solve this?:confused: The credit score of a 35 year old applying for a mortgage at Ulysses Mortgage Associates is...

    Started by staffordsc‎, 03-25-2009 02:11 PM
    • Replies: 0
    • Views: 2,225
    03-25-2009, 02:11 PM Go to last post
  11. Normal distribution and intervals

    I keep turning these around and am hoping I am on the right track Distribution of raw scores has mean=581 and sd=70. Find the interval of...

    Started by Sully‎, 05-24-2006 10:56 PM
    • Replies: 1
    • Views: 2,257
    05-30-2006, 10:10 AM Go to last post
  12. Normal Distribution and Z-Score Help

    I am working on a problem and I am having problems with the z-score I calculate. The problem is: A baseball player's average distance is 180...

    Started by Jnak‎, 09-21-2009 02:42 PM
    • Replies: 4
    • Views: 4,017
    09-22-2009, 02:26 PM Go to last post
  13. Cool normal distribution help

    Hi everyone, The question is: The time at which the pizza gets delivered follows a normal distribution with a mean of 3:00PM and a standard...

    Started by canon14‎, 08-24-2009 07:15 PM
    • Replies: 6
    • Views: 2,106
    08-25-2009, 06:42 AM Go to last post
  14. Normal Distribution Help :(

    Hi i had a problem with a normal distribution question The question is: Find a and b such that P(a<X<b)=0.90 and such that a and b are the same...

    Started by brownboy‎, 04-09-2008 02:26 PM
    • Replies: 1
    • Views: 1,928
    04-10-2008, 01:01 PM Go to last post
  15. Normal Distribution Help Please

    Hi, in my homework, I am stuck on a three part question. I have managed to do the first part of the question but can't understand how to do the...

    Started by zkm1223‎, 12-21-2010 11:42 AM
    • Replies: 3
    • Views: 2,459
    12-22-2010, 12:24 PM Go to last post
  16. Normal distribution investment problems

    I am new to this messageboard and I really need help with these two problems. Problem #1 You make an investment. Assume that returns are...

    Started by jamibimbi‎, 10-23-2007 06:17 PM
    • Replies: 1
    • Views: 3,418
    10-24-2007, 01:01 AM Go to last post
  17. Normal Distribution of a chocolate bar

    Hey all, I was hoping you can help me out with a question I have trouble translating into math. A factory manufactures chocolate bars with a...

    Started by fiffette‎, 09-18-2013 08:14 AM
    • Replies: 0
    • Views: 3,226
    09-18-2013, 08:14 AM Go to last post
  18. Question Normal distribution probability

    Hi, :wave: I have problem to solve this question. A certain brand of cattle feed comes in bags marked 40 kg. The grain company claims that the...

    Started by minagile‎, 11-05-2010 10:58 AM
    • Replies: 2
    • Views: 3,089
    11-05-2010, 01:00 PM Go to last post
  19. Normal distribution probability density function returning values > 1

    i am trying to draw a normal curve over a histogram of some data of mine and i just can't get it to come out right! Mean =1.002327404 Standard...

    Started by method‎, 10-02-2008 11:27 AM
    • Replies: 11
    • Views: 6,356
    10-03-2008, 04:50 PM Go to last post
  20. Normal Distribution Probability for a large sigma

    My question seems simple, but I'm not getting what I want. I want to know the area under the curve, to the right of x. (1-pnorm) The...

    Started by tjrome13‎, 07-19-2012 08:34 PM
    • Replies: 2
    • Views: 1,949
    07-19-2012, 08:51 PM Go to last post
  21. normal distribution probability problem

    ive got a problem that i have already solved and i am looking for verification it is right: eggs produced have an unknown distribution with a mean...

    Started by subopolois‎, 02-24-2009 05:16 PM
    • Replies: 3
    • Views: 2,812
    02-24-2009, 07:52 PM Go to last post
  22. Normal Distribution Problem

    I'm having trouble getting this one started: Jake runs the concession stand for a Chicago area minor league baseball team. He knows that hot dog...

    Started by ktgurrl‎, 04-20-2006 08:58 PM
    • Replies: 0
    • Views: 3,380
    04-20-2006, 08:58 PM Go to last post
  23. Exclamation Normal Distribution Problem

    Hi, I've been working on this problem for a while now and keep getting stuck. The problem says, The length of time before a cell phone using a...

    Started by Cinny_72‎, 04-25-2007 04:24 PM
    • Replies: 1
    • Views: 4,393
    07-03-2007, 01:37 PM Go to last post
  24. normal distribution problem

    I'm in intro. stats. Help please. Question is: Test scores normally distributed with mean=68.2 and standard deviation=10.4. Estimate probability...

    Started by stgolf‎, 03-22-2008 03:18 PM
    • Replies: 0
    • Views: 4,113
    03-22-2008, 03:18 PM Go to last post
  25. normal distribution problem

    Question..?? I cant seem to get this right. Do I find the z-score then do the problem or... please help.. question The life span of oil-drilling...

    Started by SUNSHINE09‎, 02-28-2009 09:48 AM
    • Replies: 4
    • Views: 5,506
    03-01-2009, 11:28 AM Go to last post
  26. Normal Distribution problem

    Question: an instructor is administering a final examination. She tells her class that she will give an A grade to the 10% of the students who earn...

    Started by ang6705‎, 09-28-2010 09:52 AM
    • Replies: 4
    • Views: 2,762
    09-28-2010, 11:36 AM Go to last post
  27. Normal Distribution Problem

    Hello everyone, I am stuck on some problems involving normal distribution. Any help would be GREATLY appreciated. Unfortunately, this is for an...

    Started by fizoster‎, 03-31-2013 03:03 PM
    • Replies: 1
    • Views: 5,513
    04-05-2013, 03:20 PM Go to last post
  28. Normal distribution problems

    I'm having some issues with a few questions on my practice final. Let X be a normally distributed random variable with expectation = -1 and...

    Started by player‎, 12-14-2010 10:37 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,586
    12-20-2010, 02:38 PM Go to last post
  29. Smile Normal Distribution question

    Help help i have a test on monday and i know nothing!!! I am doing these questions and i have stumbled upon a pickle... The heights of girls of a...

    Started by statshelp1‎, 01-11-2007 04:25 PM
    • Replies: 3
    • Views: 2,666
    01-13-2007, 08:47 AM Go to last post
  30. Normal Distribution Question

    Hi, Can someone please help? Product A has mean of 2980 and std dev of 500. Product B has mean of 3000 and std dev of 800. Both are normally...

    Started by BeginnerStats‎, 10-20-2007 06:17 PM
    • Replies: 0
    • Views: 2,589
    10-20-2007, 06:17 PM Go to last post
  31. Normal distribution Question

    Your favourite cereals come in packs in nominal weight of 375g. The filling machine that fills the packs naturally makes mistakes with quantities. It...

    Started by xixihaha‎, 11-29-2008 02:37 PM
    • Replies: 1
    • Views: 2,927
    11-30-2008, 02:38 AM Go to last post
  32. Normal Distribution question

    Can someone help me out with this, Based on a population that is normally distributed, with a population mean of $470 and a population standard...

    Started by 101stats101‎, 11-17-2010 06:41 PM
    • Replies: 2
    • Views: 3,264
    11-17-2010, 08:05 PM Go to last post
  33. Normal distribution question

    X is normally distributed with mean 100 and variance 81. What is the probability that X will lie between 88 and 112? Here is my approach:...

    Started by ohgallen‎, 01-10-2011 06:40 AM
    • Replies: 7
    • Views: 4,427
    01-12-2011, 05:28 AM Go to last post
  34. Normal Distribution Question.

    Hello everyone! Thanks in advance for any help you can give me. I am in my first year of college, currently taking a MAT 103 class (Quantitative...

    Started by Lewisite‎, 03-26-2012 02:32 PM
    • Replies: 1
    • Views: 6,127
    03-26-2012, 04:32 PM Go to last post
  35. Normal distribution question...help

    Please help. Heres the question http://i43.tinypic.com/2w3t836.jpg I tried (a) and got answer: 46.49% Also (b) and got 0.532m. Both are right....

    Started by pg123‎, 05-07-2009 05:05 AM
    • Replies: 0
    • Views: 2,230
    05-07-2009, 05:05 AM Go to last post
  36. Normal Distribution Questions Needed to Answered

    Find the area under the normal distribution curve. a.) Above z=1.34 b.) Above z=-1.34 c.) Between z=2.05 and z=1.34

    Started by jensen02431‎, 03-11-2008 11:25 AM
    • Replies: 1
    • Views: 3,204
    03-11-2008, 03:22 PM Go to last post
  37. Normal distribution random variates and Chi square test

    Hi, I'm having problems "verifying" normal random variates using a Chi square test, in as much as I'm getting unexpectedly (to me at least) high...

    Started by MichaelWG‎, 05-24-2011 05:54 PM
    • Replies: 3
    • Views: 5,051
    05-25-2011, 03:04 PM Go to last post
  38. Normal Distribution times constant

    I can't seem to find anything about this on the web. If I have a random variable distributed Normally: x ~ Normal(mean,variance) is the...

    Started by BigBugBuzzz‎, 09-30-2012 09:45 AM
    normal distribution
    • Replies: 4
    • Views: 33,616
    02-18-2015, 09:45 PM Go to last post
  39. normal distribution z score problem

    QUESTION: A normal distribution has a mean of 70 and a standard deviation of 15. Determine the value above which 80 percent of the values will...

    Started by subaru537‎, 01-29-2017 04:38 PM
    • Replies: 1
    • Views: 1,854
    01-29-2017, 09:55 PM Go to last post
  40. normal distribution, use 50% probablity to get standard deviation

    Hello, I have got a normal distribution with μ=0 and I know that 50% of all observations are within a certain range. How can I get the standard...

    Started by JRadinger‎, 07-18-2011 03:45 AM
    • Replies: 2
    • Views: 6,037
    07-19-2011, 11:56 AM Go to last post
  41. Normal distribution?

    i think this is a normal distribution problem. The distribution of sales for a factory has mean 20,000 units per month with a standard deviation...

    Started by el1‎, 03-31-2008 09:11 PM
    • Replies: 0
    • Views: 1,902
    03-31-2008, 09:11 PM Go to last post
  42. Normal distribution? Probability? What?! Help, please! D:

    I'm doing a sample test for a Stats quiz I have on Tuesday and I've run into a question that I just cannot get. :confused: I'm sure the method to use...

    Started by BrandiMR‎, 02-25-2010 01:38 PM
    • Replies: 2
    • Views: 3,766
    02-25-2010, 04:36 PM Go to last post
  43. Normal distributions

    I have been using my TI 84 Plus Silver Edition calculator to try and figure this out with no luck :-( Can anyone help? Assume that the heights of...

    Started by jerttehcamper‎, 07-14-2010 07:22 PM
    • Replies: 7
    • Views: 5,837
    07-15-2010, 01:58 PM Go to last post
  44. Normal Distrubtion question

    Hi, I have this question that I can not figure out: Suppose that in an apartment building run by the Probandstat rental company, the inhabitants's...

    Started by DeerPark‎, 12-04-2010 02:52 PM
    • Replies: 1
    • Views: 3,724
    12-04-2010, 04:17 PM Go to last post
  45. Normal Law

    Hi there will be very greatfull if anyone can help: If X represent the daily yield of the S&P500(US Stock indices) and Y represent the daily yield...

    Started by mikoko‎, 03-03-2016 08:35 AM
    • Replies: 3
    • Views: 2,157
    03-07-2016, 06:25 AM Go to last post
  46. Normal Probability

    My Professor teaches normal probability by using PHSTAT. This is a homework question that I am in need of assistance. A financial analyst states...

    Started by jolena‎, 02-21-2009 10:09 PM
    • Replies: 1
    • Views: 2,728
    02-23-2009, 04:40 PM Go to last post
  47. Normal Probability and finding standard deviation

    "The weekly earnings of fastfood restaurant employees are normally distributed with a mean of $395. If only 1.1% of the employees have a weekly...

    Started by Lorelei7‎, 10-21-2013 10:11 PM
    • Replies: 4
    • Views: 3,461
    10-22-2013, 09:58 AM Go to last post
  48. Normal Probability Distribution

    1. A variable is normally distributed with a standard deviation of 9.3. (a) If a probability of a value being less than 23 is to be set at 0.13,...

    Started by rockyroad23‎, 05-26-2009 07:34 PM
    • Replies: 1
    • Views: 2,865
    05-27-2009, 12:01 AM Go to last post
  49. Normal Probability Distribution

    In 2010, the population of SAT scores were normally distributed with a mean of 1020 (reading and math only) and a standard deviation of 200. The NCAA...

    Started by the_chemist‎, 01-06-2011 05:51 PM
    distribution, excel, normal
    • Replies: 2
    • Views: 5,408
    01-06-2011, 07:49 PM Go to last post
  50. Normal Probability HELP!!!

    i have a question that asks what the probability that sales drop below 15000 per month , and also 18000 per month, mean is 20000 and stddev is 3000....

    Started by el1‎, 04-18-2008 08:42 PM
    • Replies: 0
    • Views: 2,275
    04-18-2008, 08:42 PM Go to last post
  51. Normal Probability Plot

    Hi, I would be obliged if someone would assist me interpting the attached normal probability plot. To me it shows that the data DeltaBeta seems...

    Started by PeterVincent‎, 10-01-2009 12:24 PM
    • Replies: 0
    • Views: 2,536
    10-01-2009, 12:24 PM Go to last post
  52. Normal probability question (tough one I think)

    What is the probability that a randomly selected sample mean of n=100 will be greater than a randomly selected sample mean of n=1000? I'm not sure...

    Started by Delacroix‎, 06-27-2008 11:25 AM
    • Replies: 2
    • Views: 2,305
    06-27-2008, 01:33 PM Go to last post
  53. Normal probability question help

    Hello Statisticians! I would really really appreciate any help with this question: Q. The grade a student receives in an exam is given my a...

    Started by Lazyeconomist‎, 08-12-2013 11:00 AM
    continuous variable, help please, normal distribution, probability question
    • Replies: 2
    • Views: 1,429
    08-23-2013, 12:22 PM Go to last post
  54. normal question

    Can someone tell me if this is right im kind of confused, thanks!! The lifetimes of interactive computer chips produced by a certain semiconductor...

    Started by emland89‎, 12-11-2010 11:28 PM
    • Replies: 1
    • Views: 3,976
    12-12-2010, 01:15 PM Go to last post
  55. Normal R.V. (z) multiplied by a function of z

    it is found in one of the papers I've read recently and written: z ~ N(m,v) and f(z) is just any function of z then E(exp(z)*f(z)) =...

    Started by loooooo‎, 01-29-2010 08:39 AM
    • Replies: 6
    • Views: 3,330
    02-01-2010, 06:09 AM Go to last post
  56. Normal random variable question

    Hi I'm stuck on this question... I know how to do part a) but I really don't understand how to go about part b). Do I just substitute in x^2 for...

    Started by neild‎, 08-15-2010 05:50 AM
    • Replies: 1
    • Views: 3,044
    08-15-2010, 09:28 AM Go to last post
  57. Normal Random Variables, Central limit theorem

    It is desired to estimate the mean compresive strength of a particular formulation of concrete. Samples are taken and their compressive strength...

    Started by cbutt78‎, 04-18-2011 02:10 PM
    • Replies: 1
    • Views: 1,863
    04-19-2011, 10:18 AM Go to last post
  58. Normal variable day-week multiplication?

    Hello Statisticians! I would really appreciate help with this: The mean number of lemonade glasses sold in a day is 15, standard deviation is...

    Started by Lazyeconomist‎, 08-11-2013 10:41 AM
    • Replies: 2
    • Views: 1,374
    08-12-2013, 02:35 AM Go to last post
  59. Normal/Binomial Distribution question

    Hey guys, I was hoping someone could help me out with this question that I've been stuck on for a few days now. "Shorty's muffler advertises...

    Started by nataher‎, 04-06-2009 02:52 PM
    • Replies: 0
    • Views: 6,858
    04-06-2009, 02:52 PM Go to last post
  60. Normal/Logistic Distribution: Sigma vs. S

    For Normal Distribution, we have the variables x, mean and sigma (standard deviation) For Logistic Distribution, we have the variables x, mean and...

    Started by StevenCraigMiller‎, 04-09-2011 10:20 PM
    • Replies: 1
    • Views: 9,432
    04-09-2011, 10:51 PM Go to last post

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