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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: 30,337
09-30-2005, 09:44 AM
1. ### Question about 68-95-99.7 rule

Suppose that 60% of all students at a large University access course information using the internet. There is a 68% chance that the sample...

• Replies: 1
• Views: 5,419
BGM
03-25-2010, 09:18 AM
2. ### Question about uncorrelated random variables that are not independent

I understand that if random variables are uncorrelated, then Cov(X, Y) = 0 and Corr(X, Y) = 0 are among the 2 conditions. However, what is the...

• Replies: 1
• Views: 5,418
12-07-2010, 11:26 AM
3. ### Conditional expectation question

Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

• Replies: 8
• Views: 5,417
03-06-2010, 02:46 AM
4. ### Poisson and Geometric Random Variable questions

Hi all, Can anyone tell me if I got the correct answers for the below two questions? Any help is appreciated. Q:Let X have a Poisson...

• Replies: 6
• Views: 5,412
04-28-2011, 10:29 PM
5. ### pmf and cdf setup

I'm having trouble with the initial setup. Could you help me construct a probability mass function? A fair coin is tossed three times. A player...

• Replies: 1
• Views: 5,410
01-28-2009, 03:46 AM
6. ### KENO probability

"In the game of Keno, 80 numbers are displayed on a reader board. 20 of these numbers are chosen to be the winning numbers. Suppose a person has...

• Replies: 3
• Views: 5,405
02-20-2006, 10:48 AM
7. ### Moment Generating Function

Hi all, I'm supposed to find the MGF of the Gamma Distribution. Here is a link to my solution:...

• Replies: 3
• Views: 5,404
BGM
10-29-2010, 01:22 PM
8. ### Standard Deviation in Probability

I'm having troubles with this probability question... The weights of apples in a large crate have a Normal distribution with μ = 138 grams and σ =...

• Replies: 3
• Views: 5,394
04-23-2009, 12:29 AM
9. ### multiple choice

please help! if given multiple choice test with 10 questions and each having 5 choices, what is the prob of getting atleast one correct? also of...

• Replies: 1
• Views: 5,388
10-11-2005, 08:56 PM
10. ### Roulette & interesting binomial question

Hi everyone, Since I have some mathematical knowledge my friend asked me to help him out with a question with which I'm struggling: "On a...

• Replies: 5
• Views: 5,381
02-08-2011, 06:07 AM
11. ### Sampling Distribution Question

I have a couple questions here that I think I am doing correctly, just want some confirmation? Thanks! 1. Suppose that the final exam scores of a...

• Replies: 4
• Views: 5,381
02-12-2011, 12:22 AM
12. ### Interesting but simple probability question (Black/White Marble)

Hey guys, Its my first time posting in these forums. The other day a professor of mine gave me this problem which i tried to do for hours but...

• Replies: 3
• Views: 5,377
12-09-2010, 11:00 PM
13. ### Binomial random variable question

I have this question that is driving me batty & I cannot figure it out. I'm taking entry level stats online & have driven to the campus a few times...

• Replies: 5
• Views: 5,369
06-16-2009, 09:34 PM
14. ### stupid question sample variance

Hi there, I have a rather stupid question suppose I have the values of the random variable X: for example. (That's right the third...

• Replies: 13
• Views: 5,367
12-15-2008, 11:44 AM
15. ### Classical Probability and Relative Frequency Probability Approach

As classical Probability uses mathematical formula for calculation and events are equally likely. As I know Binomial distribution is used for...

• Replies: 0
• Views: 5,365
01-15-2013, 10:11 AM
16. ### Baye's Theorem Urn Problem

Hi, I am having some trouble with this problem: Suppose there are 3 urns. You choose one from which you will choose 2 balls from. Urn 1 has 4 red...

• Replies: 5
• Views: 5,352
07-11-2009, 10:44 AM
17. ### Help understanding Expectation of a sum

Hi, I would like some help with understanding the properties of the expectation operator and the summation large sigma. Denote S as the large...

• Replies: 2
• Views: 5,349
10-08-2007, 06:07 AM
18. ### How do you multiply a probability times a probability?

Just a non-math guy needing help from some math guys so I can finish an article for a magazine! I know it's easy to do, I just don't know how. ...

• Replies: 10
• Views: 5,348
01-20-2010, 01:05 PM
19. ### 13 card straight - Calculation correct?

Hello! I am trying to compute the Pr. of being dealt a 13 card straight out of a standard 52 card deck. (ie. 23456789TJQKA) Here's my...

• Replies: 1
• Views: 5,347
03-14-2009, 01:38 PM
20. ### Need Help Please

There is a group of 200 college students, 138 are taking psychology, 115 are taking sociology, and 91 are taking both. a.) How many of the...

• Replies: 4
• Views: 5,346
09-10-2006, 10:48 PM
21. ### correlation coefficient

hi another exam preparation question: let x1..xn be random varibale independent and with same dist. they have exp. u and variance v. let m be a...

• Replies: 2
• Views: 5,343
01-24-2010, 07:49 AM
22. ### Probability of an event after combining (Union) two sample spaces

Can anybody help me how to solve the following problem. Suppose we have an event x and two sample spaces s1,s2. let the probability of x is 0.3, 0.4...

• Replies: 9
• Views: 5,339
ahb
09-20-2012, 01:25 AM
23. ### Sampling distributions of estimates question?

Hi there, I'm stuck on a question regarding the chap. in our course called: Sampling distributions of estimates. Here is the question: My thoughts...

• Replies: 3
• Views: 5,338
09-10-2010, 06:16 AM
24. ### Help with stats assignment

An airline knows that 5 percent of the people making reservations on a certain flight will not show up. Consequently, their policy is to sell 52...

• Replies: 2
• Views: 5,335
01-26-2011, 12:13 AM
25. ### joint pmf of 2 dependent variables

Hi, I am having trouble calculating the joint pmf of two "not necessarily independent" RV's. The information given was that X~Bernoulli(p),...

• Replies: 4
• Views: 5,334
12-13-2010, 12:27 AM
26. ### help with 2 PROBLEMS... THANKS!

I could use help with these two problems please. 8. Ricardo's car rental offers five different types of vehicles, compact cars (CC), midsize cars...

• Replies: 3
• Views: 5,330
06-03-2008, 04:24 PM
27. ### True or false?

Is this statement true or false? The central limit theorem says that, as n tends to infinity the distribution of (Y - E(Y))/Standard deviation...

• Replies: 10
• Views: 5,328
08-24-2010, 11:26 PM
28. ### Discrete Distributions: Coin Toss

Let X be the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. a. Find the probability mass function...

• Replies: 3
• Views: 5,326
04-13-2008, 08:07 PM
29. ### even and odd probability of coin

hi, i am preparing for an exam and i wondered if some one could show me explicitly how to calculate the probability of getting an even number of...

• Replies: 1
• Views: 5,323
BGM
01-24-2010, 08:02 AM
30. ### Interpreting meaning of predicted values when using a Generalized Linear Model

I’m having trouble understanding what the predictions actually mean when using a Generalized Linear Model with e.g. a Poisson error distribution and...

• Replies: 2
• Views: 5,320
04-04-2011, 12:30 PM
31. ### Batting Average & Probability

A softball team's first 4 hitters are Sam (batting average .500), Gina (batting average .400), Tom (batting average .737), and Kerry (batting average...

• Replies: 1
• Views: 5,319
02-26-2008, 01:43 PM
32. ### probabiliry problem under the conditional section

Please help me to solve this. i dont know where to start. 1)Suppose that in Vancouver,B.C., the probability that a rainy fall day is followed by a...

• Replies: 1
• Views: 5,287
02-20-2009, 11:12 AM
33. ### The Dice Game

Hello everyone, I want to ask questions about my task. Below are the description. Thank you in advance. Kind regards, Kirman. The aim...

• Replies: 3
• Views: 5,283
02-19-2012, 01:38 PM

Wish I'd found your site a long time ago! I have been working on this all day long with no success and I don't know what to do. I am to...

• Replies: 2
• Views: 5,277
11-15-2005, 12:10 PM
35. ### help

I can not figure this problem out! I don't think there is enough info, but there is an answer in the back: 0.271 The problem: Using Composite...

• Replies: 2
• Views: 5,276
02-25-2008, 01:09 PM
36. ### problem so simple its confusing?? need help

I need help with a homework problem. Because not all airline passengers show up for their reserved seat, an airline sells 125 tickets for a flight...

• Replies: 1
• Views: 5,273
10-05-2008, 04:18 PM
37. ### Industry-Wide safety factor of 4

I want to hang a 10# picture on the wall so I carefully and slowly load the hanger with 40#. It doesn't fall. What can I say at this point about...

• Replies: 6
• Views: 5,265
05-08-2010, 10:20 AM

So the question is: A restaurant chef prepares a tossed salad containing, on average, 5 vegetables per day. Find the probability that the salad...

• Replies: 3
• Views: 5,263
08-11-2009, 12:06 PM
39. ### identifying the distribution of a data set

Dear all I am creating a software that is reading tcp packets from a link. I have the following information available: size of the packet: ...

• Replies: 4
• Views: 5,257
08-16-2006, 10:58 PM
40. ### Binomial and exponential distribution?

Hi everyone. Could you help me with these two following problems: 1. A machine normally makes items of which 4% are defective. Every hour, the...

• Replies: 1
• Views: 5,255
01-25-2011, 04:32 AM
41. ### Help with a hw question

I am taking my first probability course and need some help. I am working on some homework. The question I am on now asks... Consider...

• Replies: 5
• Views: 5,251
BGM
12-04-2010, 12:51 PM
42. ### Three shooters, probability that two of them hits

I have a little problem. There are three shooters ( i= 1,2,3) and they hit the target with probabilities P(A1) = 1/2, P(B1) = 2/3, P(A3) = 3/4....

• Replies: 14
• Views: 5,247
10-24-2011, 01:18 AM
43. ### probability and random processes with applications to signal processing Henry Stark

Hi, I need this e book Probability and Random Processes with Applications to Signal Processing (3rd Edition) Henry Stark, John W. Woods. Has...

• Replies: 0
• Views: 5,243
mkl
09-27-2010, 02:52 PM
44. ### Probability/Counting Rules Help

Hey: Would anyone know how to approach these two problems below? Many thanks in advance. A sales company purchases 15 new chars for its top...

• Replies: 2
• Views: 5,242
05-06-2006, 04:33 PM
45. ### need help

hey kind people, i got some problems from my statistics assigment that i dont understand (couldnt get this 4 out of 15), so if you can give me...

• Replies: 2
• Views: 5,239
12-11-2006, 08:32 PM
46. ### Predicting probability with standard deviations, mean high and low values.

I registered on this forum specifically to ask this question. This is not homework, it's simply a for fun/hobby problem I am trying to solve. This...

• Replies: 5
• Views: 5,238
06-14-2013, 03:55 AM
47. ### probability--standard deviation question??

A machine has been programmed to bore holes with a mean diameter = 0.15 mm and with a standard deviation = 0.005 mm. Parts will be rejected if the...

• Replies: 3
• Views: 5,237
10-18-2005, 07:39 PM
48. ### help with chi square freedom sums

How do i show that the a + is a ? How can i use moment generating functions to do this?

• Replies: 5
• Views: 5,234
11-25-2010, 10:12 PM
49. ### Expected Value of Convolution

I am interested in estimating E where... - X ~ Normal(mu,sigma) - h(.) = CDF of Standard Normal distribution - g(.) = inverse CDF of Beta...

• Replies: 3
• Views: 5,230
03-28-2013, 10:21 AM
50. ### No clue when to use nCr or multiply the probabilites..

I'm completely baffled as to when to use nCr or multiply the probabilites.. Here's an example.. Jane buys 5 jam donuts, 4 cream donuts and 3...

• Replies: 1
• Views: 5,225
05-01-2012, 02:41 PM
51. ### Expected Maximum for series of Poisson Distributions

The problem I am working on is this: I have a detector which is an array of 4096 pixels. Each pixel receives an average of N counts. Since this is...

• Replies: 3
• Views: 5,221
04-16-2010, 07:23 AM
52. ### simple proof of expected value...

CV are random variables. Whats a hint to show if C<=V, then E(C)<=E(V)? my bad attempt if C<=V then P(C=s)<=p(V=s) for all s so summation of...

• Replies: 6
• Views: 5,220
BGM
11-09-2010, 03:47 PM
53. ### Uniform Continuous Probability

Hi all, The question i have has these givens: t = years f(t) = 10(1-5t) for 0=< t =< 1/5 a) What is probability that a machine will last...

• Replies: 5
• Views: 5,213
07-19-2010, 11:18 PM
54. ### Bayes Theorem Question

Hello all, I have a homework question which I can not figure out: A stock market analyst examined the prospects of the shares of a large number...

• Replies: 1
• Views: 5,209
09-22-2008, 11:42 PM
55. ### Poisson with events per week for calculating probability per Quarter?

Hi all, I have a question regarding the Poisson distribution. (I searched the forum before creating this post, I couldn't find a similar post) ...

• Replies: 4
• Views: 5,206
09-05-2008, 11:31 AM
56. ### Exam Question Probability.

Pretty straightforward question, I just want to double check what I told a friend. She has 11 exam questions to study for, only 6 of these will be...

• Replies: 3
• Views: 5,203
06-20-2008, 01:36 AM
57. ### Question about probability - roulette wheel

Hi there, Have a question about the topic above. I spin a roulette wheel and wait until 31 of the 37 numbers have come up. I then cover the...

• Replies: 6
• Views: 5,202
02-09-2010, 01:23 PM
58. ### exponential distribution probability help

This is a modified version of one of my homework questions. Please help me out, and show your work so I know how to calculate it myself. The only...

• Replies: 3
• Views: 5,191
10-26-2009, 11:21 PM

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