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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: 30,403
09-30-2005, 09:44 AM

a) use normal approx P( x>810) = P ( z> (810-.73*1100)/(.73*.27*1100))=.4871 or 48.71% b) P (x<1030) = P(z<...

• Replies: 1
• Views: 1,904
07-07-2013, 04:34 AM
2. ### Probability of scrabble game based on scores

How do i calculate the probability in a scrabble game based on scores. Lets say Player A has 42 score and Player B has 90. How do i calculate the...

• Replies: 1
• Views: 1,440
09-18-2012, 01:54 PM
3. ### Expectation of iid variables

Hello I hope to get some help with this one. Let X_1,X_2 be iid random variables, both concentrated on I\subset\mathbb{R}_+. Define ...

• Replies: 7
• Views: 4,158
BGM
12-17-2012, 12:18 PM
4. ### Craps Probability

I was a math major at Johns Hopkins, but for some reason this is giving me trouble. I want to know the probability of rolling EITHER a 4, 5, 9, or...

• Replies: 3
• Views: 1,863
BGM
04-15-2012, 05:36 AM
5. ### Dice probability question

What are the odds of rolling 2d6(2 6-sided dice) three times and getting two 3s? How about rolling 4 times; 5 times? I know rolling a 2d6 has a...

• Replies: 1
• Views: 1,093
04-30-2016, 01:36 PM
6. ### 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: 1,893
BGM
04-19-2011, 10:18 AM
7. ### CHI^2 test for binomial variables which are not normally distributed

Hello, Assume that you have X_1\cdot X_n independant random variables. If they are normally distributed we can use the Chi^2 statistical test to...

• Replies: 0
• Views: 906
CBW
06-10-2015, 07:59 AM
8. ### need help on permutations

I am trying to solve a problem that can be represented by rolling an n-sided die r times. I need to be able to figure out the probabilities of the...

• Replies: 1
• Views: 1,428
BGM
04-11-2012, 04:14 PM
9. ### probability help

Hi I am new to statistics and have been given the following question: Suppose X~B(16, 0.75) How do I calculate E(X) and V(X)? All the...

• Replies: 5
• Views: 2,561
ccs
12-13-2010, 01:59 PM
10. ### New to probability

Can someone help me solve the following P(0.55≤ z ≤ 1.28). How does one determine a left side vs right side table?

• Replies: 1
• Views: 2,221
06-29-2016, 12:01 AM
11. ### Chance of an Occurance

ok, I am an accountant, not a statistician. Something happened to me personally and I would like to figure out the probability that it would have...

• Replies: 8
• Views: 3,001
07-30-2013, 11:49 PM
12. ### Any suggestions on how to figure out these two problems????

Im getting frustrated because....I have been looking through my textbooks and notes trying to figure out how to set these two problems up...Can...

• Replies: 1
• Views: 4,680
02-19-2012, 05:47 PM
13. ### help with setting up formula

I am struggling with formula set up for the following practice problem study of caffeine consumption, smoking, etoh consumption and physical...

• Replies: 1
• Views: 1,988
06-17-2011, 11:32 AM
14. ### Determine how close a real distribution is to an ideal one.

My apologies if this is an insultingly easy question: I'm trying to determine how close a real distribution is to an ideal one. Example: a...

• Replies: 1
• Views: 1,608
09-28-2011, 11:28 AM
15. ### Find Maximum Likelihood Estimator of Gamma Distribution

Find Maximum Likelihood Estimator of Gamma Distribution Given: f(x; β) = * x * e^(-x/ β) for 0 < x < infinity EX = 2β and VarX =...

• Replies: 0
• Views: 4,841
02-25-2012, 08:03 PM
16. ### Probability of winning a jackpot

Hi, i'm new here. I was wondering whats the probability of wining a football prediction jackpot with a win draw or loose options in 13 games...

• Replies: 1
• Views: 1,686
12-22-2015, 05:31 PM
17. ### Pure Birth Process

Hi guys, I'm having some trouble with this question: For part i), I have df_0/dt = -\lambda f_0 giving f_0=\exp(c_1-\lambda t) The...

• Replies: 0
• Views: 1,117
01-13-2013, 08:15 PM
18. ### probability of 8 successes out of 256 events

Hi all hope you are well, i was trying to calculate what the probability of getting exactly 8 successes in 256 events. I used a Binomial on line...

• Replies: 5
• Views: 1,515
05-25-2015, 06:12 AM
19. ### probobility of a tax inspecton

From our statistics the probability of getting an inspection in any single week is a pprox 1,000 : 1 I was trying to work out the probability...

• Replies: 1
• Views: 161
09-27-2017, 06:52 PM
20. ### Sum of two random variables each independent with the third?

The following statement seems obvious, but I found it difficult to prove formally, even assuming that the variables are discrete. Let X and Y are...

• Replies: 1
• Views: 3,053
12-29-2008, 11:32 AM
21. ### Help with a problem.

Problem: 2. Photocards-R’-Us is a photo card printer. For this year, they have found that 10% of the cards they make are of inferior quality (blurred...

• Replies: 7
• Views: 2,398
11-27-2011, 07:40 AM
22. ### Keno or Lotto Revisited

Jerry, Well, you asked for a new thread ... funny thing is, we were both replying at nearly the same moment, so I had responded to the old thread....

• Replies: 3
• Views: 3,013
10-19-2006, 06:44 AM
23. ### Lottery Probabilities

I'm no statistician but hope for some help from the experts. The UK national lottery has been drawn roughly 1500 times since 1994. The frequencies...

• Replies: 2
• Views: 2,994
09-15-2009, 09:08 PM
24. ### Card Game Probability Question!

The game is screw your neighbor! Four card players at a table. Two players have 1 chip two players have 2 chips. The player who gets delt the low...

• Replies: 1
• Views: 1,731
07-27-2011, 05:35 PM
25. ### Need help with probabilities for work

All, I am in desperate need of some help that isn't school related. I have some issues at work that need to be addressed and they deal with...

• Replies: 6
• Views: 2,159
05-24-2011, 03:40 PM
26. ### Probability | Card deck

A card is drawn from a well shuffled deck of 52 cards. Find P(drawing a face card or a 4). Now since the cards can't be replaced, would you get...

• Replies: 1
• Views: 6,481
03-22-2011, 01:58 AM

5.20 An investor plans to put $50,000 in one of four investments. The return on each investment depends on whether next year’s economy is strong or... • Replies: 1 • Views: 5,455 07-11-2007, 12:33 AM 28. ### Sample mean Question Research indicates that, in general, women in United States earn$0.77 for each \$1.00 earned by a man in an equivalent job. A sample of 100 women...

• Replies: 0
• Views: 2,345
02-21-2011, 03:00 AM
29. ### simple cdf and pdf problem?

Let X and Y be independent random variables, uniformly distributed in the interval . Find the cumulative distribution function and the probability...

• Replies: 1
• Views: 3,855
BGM
01-27-2012, 01:06 PM
30. ### Distribution of a random sum of random non-iid variables

I'm trying to find the probability distribution of a sum of a random number of variables which aren't identically distributed. Here's an example: ...

• Replies: 1
• Views: 1,410
05-11-2017, 03:32 AM
31. ### Spearman Correlation and Correlation of Attributes

Hi All, Could anyone advise on this question? Will a Spearman Correlation provide a description of the Correlation of Attributes? I'm...

• Replies: 0
• Views: 1,296
12-17-2012, 10:08 PM
32. ### probability model driving me crazy

Hello and I am desperate for some help with a homework question. We have been studying the binomial model were given a problem that does not behave...

• Replies: 1
• Views: 2,172
10-20-2006, 01:18 PM
33. ### Predicting server load for MMORPG

deleted content

• Replies: 0
• Views: 2,708
09-05-2010, 03:50 PM
34. ### Help, suspiciously common birthdate

I have a database with 41469 medical practice patients. The patients have 22499 different (unique) dates of birth. Sorting by occurrence produces...

• Replies: 4
• Views: 2,576
09-27-2009, 02:23 AM
35. ### Probability Question

Working through an sample paper for an upcoming exam and I've been struggling with the following stock trading problem "A total of 576 such...

• Replies: 7
• Views: 1,798
07-30-2013, 11:17 AM
36. ### almost sure convergence

Hi, I've got this question I'm trying solve for days already. Let Xn be random variable = 2 with prob 1/3 and = 1/2 with prob 2/3 Let Zn be...

• Replies: 5
• Views: 4,305
BGM
01-13-2012, 04:20 AM
37. ### Lottery Probability

Having a really tough time with this one. Six different winning numbers are selected at random from, 1 to 37. A player also selects six...

• Replies: 2
• Views: 3,110
11-04-2006, 01:30 PM
38. ### Easy question regarding percentages

I am currently working on a website project and am wishing I had paid more attention in my statistics class from a few semesters ago. Lets say...

• Replies: 3
• Views: 1,813
08-25-2009, 02:05 AM
39. ### Can I calculate a p-value here?

Hey everyone! Ok so I ran a biochemistry experiment the other day and I wanted to calculate a p-value for my data. The experiment is pretty...

• Replies: 2
• Views: 7,432
04-02-2009, 04:47 PM
40. ### Question about use of Kernel probability Distribution

Hello everyone, I had a general question on the use of kernel probability density estimation for one dimensional data. I want to apply it to my...

• Replies: 0
• Views: 2,400
04-05-2009, 08:35 PM
41. ### Conditional Probability [HELP]

I = innocent, G= guilty P(I) = 1, P(G) = 0 Conditional Probability Test Results: P(+ | I ) =0, P(+ | G ) = 1 Find P(G | +) in other words...

• Replies: 5
• Views: 2,548
09-11-2007, 06:02 PM
42. ### Need lots of help - Binomial Probabilities

I completely confused on this my problem is this: Richard has just been given a 10 question multiple-choice quiz in his history class. Each...

• Replies: 2
• Views: 13,382
11-16-2005, 10:29 PM
43. ### Variance of Zero

If you have a variance of zero, will the probability be 100%, 50% or "cannot be determined"? Thanks!

• Replies: 2
• Views: 2,869
03-04-2008, 03:49 PM
44. ### Expected searches calculation for finding a discrepancy

Say you have an urn containing two different coloured balls. If the task is to keep blindly selecting balls without replacement until a 'target'...

• Replies: 1
• Views: 1,821
BGM
04-23-2013, 12:41 AM
45. ### Z-values and probability

Suppose concentration of arsenic (in ppb) in groundwater sampled quarterly from a particular well can be modeled with a normal distribution with a...

• Replies: 0
• Views: 1,334
03-09-2014, 07:30 PM
46. ### Probabilities involving sample means

I'm having trouble with this, I need help! I construe that the heights of hobbits are approximately normally distributed with mean 36 inches and...

• Replies: 0
• Views: 4,259
11-28-2007, 11:09 PM
47. ### When dickey fuller test returns t statistics > 0

When I ran the dickey fuller test on a variable, the test indicates that the t statistics is greater than zero and is greater than the absolute value...

• Replies: 0
• Views: 3,491
05-29-2010, 10:16 PM
48. ### Just a tiny bit of assistance

Among U.S. households, 24&#37; have telephone answering machines. If a telemarketing campaign involves 2,500 households, find the probability that more...

• Replies: 1
• Views: 2,294
08-12-2008, 09:30 PM
49. ### Probability of Failure of components...

Hi there, My question is pretty simple, but I think I am going about the wrong way. An aircraft part has a .40 probability of being...

• Replies: 1
• Views: 934
BGM
02-05-2015, 12:40 AM
50. ### Probability Function Problem

A customer is equally likely to select each of six product brands, labeled "brand one," and so forth. Let X equal the brand number selected. Let Y...

• Replies: 1
• Views: 1,704
BGM
01-20-2012, 06:59 AM
51. ### Help with derivation of probability density of {event generation} & {event detection}

I would like to specify a new probability distribution that relates to an event of size M being produced by some process and subsequently detected....

• Replies: 6
• Views: 1,912
04-05-2012, 05:24 PM
52. ### Random Variable with normal distribution

I am stuck on this problem. Mean of 50, standard deviation of 10. What is the probability the random variable will assume a value between 45...

• Replies: 1
• Views: 2,624
03-08-2012, 03:40 PM
53. ### Z tables

Can someone tell me what Z upper and Z lower values are? I am trying to find theoretical parts out of spec. The specifications are -.30 to .30 with...

• Replies: 5
• Views: 6,725
01-12-2006, 12:31 PM
54. ### How to apply a distribution and derive a failure rate?

please excuse me for my newbie question. certain factors influence the power requirements for my system which comprises of several components. i...

• Replies: 4
• Views: 4,985
10-27-2008, 01:18 PM
55. ### ECC failure in memory device (probability of bad word transmission)

so this is my problem and the solution. i am looking for concurrence or disagreement with my method. any help will be appreciated. ECC works for...

• Replies: 0
• Views: 3,011
12-10-2008, 02:15 PM
56. ### Probability of solder ball inside a sealed package able to cause a failure

I have a hermetically sealed semiconductor package, NAND. And I have some foreign object debris (FOD), solder balls to be exact, inside this device....

• Replies: 0
• Views: 866
06-04-2015, 09:21 AM
57. ### Need Help, how to interpret the goodness of fit, bivariate probit model

I ran proc qlim in SAS, bivariate probit model, but dont know how to interpret the results. Could anyone please help me out of this problem.... ...

• Replies: 0
• Views: 5,516
03-04-2009, 04:01 AM

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