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# Forum: Probability

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

1. ### 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)...

• Replies: 0
• Views: 30,195
09-30-2005, 09:44 AM
1. ### Normal Distribution

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

• Replies: 3
• Views: 3,404
04-08-2006, 02:59 PM
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?

• Replies: 1
• Views: 2,316
05-24-2008, 11:46 AM
3. ### Normal Distribution

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

• Replies: 4
• Views: 10,961
04-24-2010, 01:34 AM
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...

• Replies: 1
• Views: 3,070
09-28-2010, 11:36 PM
5. ### 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...

• Replies: 2
• Views: 1,193
08-13-2012, 08:59 AM
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...

• Replies: 1
• Views: 1,013
12-13-2015, 12:10 PM
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...

• Replies: 2
• Views: 1,164
04-26-2016, 01:31 AM
8. ### 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...

• Replies: 1
• Views: 2,337
12-31-2016, 09:36 AM
9. ### 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...

• Replies: 0
• Views: 2,225
03-25-2009, 02:11 PM
10. ### 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...

• Replies: 1
• Views: 2,257
05-30-2006, 10:10 AM
11. ### 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...

• Replies: 4
• Views: 4,017
09-22-2009, 02:26 PM
12. ### 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...

• Replies: 6
• Views: 2,106
08-25-2009, 06:42 AM
13. ### 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...

• Replies: 1
• Views: 1,928
04-10-2008, 01:01 PM
14. ### 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...

• Replies: 3
• Views: 2,459
BGM
12-22-2010, 12:24 PM
15. ### 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...

• Replies: 1
• Views: 3,418
10-24-2007, 01:01 AM
16. ### 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...

• Replies: 0
• Views: 3,226
09-18-2013, 08:14 AM
17. ### 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...

• Replies: 2
• Views: 3,089
11-05-2010, 01:00 PM
18. ### 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...

• Replies: 11
• Views: 6,356
10-03-2008, 04:50 PM
19. ### 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...

• Replies: 2
• Views: 1,949
07-19-2012, 08:51 PM
20. ### 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...

• Replies: 3
• Views: 2,812
02-24-2009, 07:52 PM
21. ### 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...

• Replies: 0
• Views: 3,380
04-20-2006, 08:58 PM
22. ### 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...

• Replies: 1
• Views: 4,393
07-03-2007, 01:37 PM
23. ### 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...

• Replies: 0
• Views: 4,113
03-22-2008, 03:18 PM
24. ### 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...

• Replies: 4
• Views: 5,506
03-01-2009, 11:28 AM
25. ### 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...

• Replies: 4
• Views: 2,762
09-28-2010, 11:36 AM
26. ### 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...

• Replies: 1
• Views: 5,513
04-05-2013, 03:20 PM
27. ### 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...

• Replies: 15
• Views: 5,586
12-20-2010, 02:38 PM
28. ### 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...

• Replies: 3
• Views: 2,666
01-13-2007, 08:47 AM
29. ### 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...

• Replies: 0
• Views: 2,589
10-20-2007, 06:17 PM
30. ### 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...

• Replies: 1
• Views: 2,927
11-30-2008, 02:38 AM
31. ### 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...

• Replies: 2
• Views: 3,264
11-17-2010, 08:05 PM
32. ### 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:...

• Replies: 7
• Views: 4,427
01-12-2011, 05:28 AM
33. ### 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...

• Replies: 1
• Views: 6,127
03-26-2012, 04:32 PM
34. ### Normal distribution question...help

• Replies: 0
• Views: 2,230
05-07-2009, 05:05 AM
35. ### 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

• Replies: 1
• Views: 3,204
03-11-2008, 03:22 PM
36. ### 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...

• Replies: 3
• Views: 5,051
05-25-2011, 03:04 PM
37. ### 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...

• Replies: 4
• Views: 33,616
02-18-2015, 09:45 PM
38. ### 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...

• Replies: 1
• Views: 1,854
01-29-2017, 09:55 PM
39. ### 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...

• Replies: 2
• Views: 6,037
07-19-2011, 11:56 AM
40. ### 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...

• Replies: 0
• Views: 1,902
el1
03-31-2008, 09:11 PM
41. ### 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...

• Replies: 2
• Views: 3,766
02-25-2010, 04:36 PM
42. ### 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...

• Replies: 7
• Views: 5,837
07-15-2010, 01:58 PM
43. ### 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...

• Replies: 1
• Views: 3,724
12-04-2010, 04:17 PM
44. ### 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...

• Replies: 3
• Views: 2,157
03-07-2016, 06:25 AM
45. ### 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...

• Replies: 4
• Views: 3,461
10-22-2013, 09:58 AM
46. ### 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,...

• Replies: 1
• Views: 2,865
05-27-2009, 12:01 AM
47. ### 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...

• Replies: 2
• Views: 5,408
01-06-2011, 07:49 PM
48. ### 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....

• Replies: 0
• Views: 2,275
el1
04-18-2008, 08:42 PM
49. ### 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...

• Replies: 2
• Views: 2,305
06-27-2008, 01:33 PM
50. ### 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...

• Replies: 2
• Views: 1,429
08-23-2013, 12:22 PM
51. ### 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...

• Replies: 1
• Views: 3,976
12-12-2010, 01:15 PM
52. ### 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)) =...

• Replies: 6
• Views: 3,330
02-01-2010, 06:09 AM
53. ### 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...

• Replies: 1
• Views: 1,863
BGM
04-19-2011, 10:18 AM
54. ### 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...

• Replies: 2
• Views: 1,374
08-12-2013, 02:35 AM
55. ### 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...

• Replies: 0
• Views: 6,858
04-06-2009, 02:52 PM
56. ### 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...

• Replies: 1
• Views: 9,432
04-09-2011, 10:51 PM

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