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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: 30,326
09-30-2005, 09:44 AM
1. ### finding probability

According to the Bureau of Navel Standards, 75 percent of all people are "inners," (that is their belly buttons poke inward); everyone else is an...

• Replies: 7
• Views: 5,176
04-27-2006, 01:03 PM
2. ### I need help with homework please.

The teacher just kind of highlights the basics of it and tells us to read the chapter but the book makes absolutely no sense whatsoever. If someone...

• Replies: 1
• Views: 5,174
02-27-2012, 10:20 PM
3. ### Help with draw of random numbers

Hi I would like some help with the formula to work out the following problem. If you have the numbers 1-80 and you draw 20 unique numbers from the 80...

• Replies: 3
• Views: 5,163
BGM
01-03-2011, 10:58 AM
4. ### How to find mean and variation from information given?

I am very lost, my teacher gives us a bunch of notes that make absolutely no sense to me. This is the question im stuck on: -- 41% of adults have...

• Replies: 4
• Views: 5,159
10-30-2014, 03:33 PM
5. ### Recurring Event, Probability of Totals

Hi. I'm actually not working on homework, but trying to make odds tables for a card game called Summoner Wars to practice/learn math for fun. ...

• Replies: 1
• Views: 5,157
BGM
07-25-2011, 11:53 PM
6. ### Examples of strictly stationary sequence?

Hi. I come across this 'stationary' term quite frequent. I find 'stationary increment' in Poisson process. But, now, in extreme value theory, i find...

• Replies: 0
• Views: 5,156
05-03-2010, 05:25 AM
7. ### Difficulty correlating terminology with symbols.

The book we are using for this class uses words instead of the symbols in some of the homework problems we are using. My question is: Is P(A...

• Replies: 2
• Views: 5,155
02-17-2006, 12:11 PM
8. ### Discrete Probability

I am not sure if I am doing this question right so I just want to verify. Viruses such as Trojan programs and worms, reach networks by requests...

• Replies: 1
• Views: 5,155
11-08-2007, 02:45 PM
9. ### Probability problem

Hello everyone, I don't know how to calculate a probability, relating a lotto game. The problem is: if I choose 10 random numbers in a 6/49 game,...

• Replies: 0
• Views: 5,155
06-23-2008, 09:10 AM
10. ### Probability Problem

I need some help with this probability problem. On any given day, Jen will sell 85% of her baked goods. For a sample of 500 potential customers,...

• Replies: 1
• Views: 5,152
04-24-2007, 01:15 AM
11. ### What data transformation should I apply to count data, which includes zero values?

What data transformation should I apply to count data, which includes zero values and follows the negative binomial distribution, prior to the...

• Replies: 1
• Views: 5,150
05-13-2010, 10:27 AM
12. ### probability help

I'm not looking for simply the answer but i need to know the step by step solution process, and what formula you used if any to solve for it please....

• Replies: 7
• Views: 5,148
09-18-2005, 11:18 AM
13. ### probability using combinations/permutations

a student has an exam, the teacher gives 30 questions and 10 of the 30 will be on the final exam. if the student knows how to solve 25 of the 30,...

• Replies: 1
• Views: 5,147
02-05-2009, 01:08 AM
14. ### Can't seem to figure this one out...

This question must be trickier than I thought: A statistics professor and his wife are planning to take a 2-week vacation in Hawaii, but they...

• Replies: 1
• Views: 5,145
03-02-2010, 02:35 PM
15. ### log-logistic distribution function

I need to create a function (in Mathematica) to generate a log-logistic distribution (also called a Fisk distribution). I know the log-logistic...

• Replies: 0
• Views: 5,143
a^2
02-07-2008, 11:01 AM
16. ### Probability of Selection of committee officers

I have tried several ways to do this problem, but I am stumped!! My original answer which was wrong was 4 nPr 4/12 nCr 4 = 24/11880 = There is a...

• Replies: 3
• Views: 5,143
06-27-2010, 02:58 PM
17. ### Find the joint density of Z=X+Y,W=X-Y

Question:Let X,Y be independent random variables with X~Exp(lambda1) and Y=~Exp(lambda2). Find the joint density of Z=X+Y,W=X-Y ...

• Replies: 1
• Views: 5,142
10-04-2008, 09:14 PM
18. ### pemutation

how many permutations of three items can be selected from a group of six? Us the letters A, B, C, D, E, and F to identify the items, and list each...

• Replies: 0
• Views: 5,135
10-27-2007, 05:37 PM
19. ### Hopefully an easy 'first post'!

Hi All. I'm a newbie to the forums, and will hopefully introduce myself with an eay-enough question on probability! OK, here goes: I have...

• Replies: 14
• Views: 5,135
09-09-2008, 03:01 PM
20. ### calculating expectation and variance

Hi, I wanted to know if i'm on the right track with this problem. So far, for expectation I multiply 15/60 and 12. Not sure if this is correct....

• Replies: 4
• Views: 5,135
02-01-2009, 02:17 PM
21. ### Random Walk, Programming it.

Hi, I've recently became interested in learning about stochastic processes so after a bit of light reading, i decided to put this into action. I...

• Replies: 4
• Views: 5,135
04-25-2013, 03:50 PM
22. ### Envelope-letter matching problem

Suppose we have "n" envelopes and "n" letters and we put letters to envelopes at random. Let I_i = I({i-th letter matches}) =1 if the i-th letter...

• Replies: 1
• Views: 5,133
07-10-2009, 06:34 AM
23. ### Expected Value of stocastically independent random variables

Hello. This seems like an easy problem, but I'm having trouble getting started. Hopefully someone can give me a hint. X_1,...,X_n are...

• Replies: 3
• Views: 5,130
05-30-2007, 04:17 PM
24. ### statistics

if T follows a t7 distribution, find t0 such that P(|T|<t0)=.9 and P(T>t0)= .05

• Replies: 2
• Views: 5,130
10-18-2011, 08:07 AM
25. ### True or False Probability ?

A used car lot has 15 cars. Five of these cars were manufactured in the US and the remainder were made in other countries. If two cars are...

• Replies: 1
• Views: 5,124
10-09-2005, 04:23 PM
26. ### Probability Density Function

Given that: f(y1, y2) = 3 - 3y2 where 0 < y1 < y2 < 1 I'm trying to find the probability: P(Y1 < .5|Y2 < .75), which is a conditional density. ...

• Replies: 1
• Views: 5,122
09-27-2006, 12:01 PM
27. ### converting geometric distribution to the exponential family

converting geometric distribution to the exponential family f(x,p)=p^x*(1-p) does anyone know how to do this

• Replies: 1
• Views: 5,114
03-30-2011, 09:01 AM
28. ### Probability Question

Hi, I have two questions that I'm currently struggling with, the first one states that there are 40 red balls, 40 green balls, and 20 blue balls....

• Replies: 1
• Views: 5,111
11-04-2006, 08:27 AM
29. ### Help! Test Tomorrow

O.K. Here is my question that I am struggling with: Of all college freshman that try out for the track team, the coach will accept only 30%. If 15...

• Replies: 0
• Views: 5,110
04-20-2006, 11:24 PM
30. ### Percentile of a Poisson variable

Hi, How can I find the 90th percentile of a Poisson random variable with lamba = 0.4 ? I tried: e-0.4 (0.4^.90) / 0.9! but this gives...

• Replies: 3
• Views: 5,110
11-03-2008, 04:16 PM
31. ### Symmetric distribution

Hi everyone! I am trying to understand the solution of a problem. "It says that x has a symmetric distribution, so that E=0, where mu=E". Now,...

• Replies: 2
• Views: 5,103
01-19-2010, 09:33 PM
32. ### Bivariate Normal Distribution

I can't figure out this problem. The definition for Bivariate Normal Distribution is too long and complicated to type, but can be easily found if...

• Replies: 1
• Views: 5,103
BGM
05-02-2012, 03:12 AM
33. ### Probabilities in a 7-game series

This probably isn't relevant, but this is not homework help. I'm just a curious adult who hasn't taken a stastics class in a few years so I'm pretty...

• Replies: 3
• Views: 5,097
01-11-2012, 03:36 PM
34. ### Bayesian inference -(unknown mean and variance | and a proof)

hello, i take a bayes lesson. there are 3 questions as my homework, i did one of them. i am new to statistics, so instructor said i can get help as...

• Replies: 4
• Views: 5,095
10-22-2010, 05:07 PM
35. ### Confusing...

Hi,i want to ask.....(let X=sample mean) 1.what is the prob that the sample mean will be smaller then 100 or larger than 50? so my expression is:...

• Replies: 3
• Views: 5,091
12-23-2010, 06:56 AM
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: 5,090
05-25-2011, 03:04 PM
37. ### Probability question help!!!!

I'm stuck and could use some help. I am finishing my hw and stumbled upon two problems that I cannot figure out out to do. 1. It has been...

• Replies: 2
• Views: 5,089
10-30-2012, 12:38 AM
38. ### Matching sets on Dice

For those of you who know dice, I have this question: You roll multiple dice (with the same number of sides), what are the chances of getting...

• Replies: 6
• Views: 5,080
01-25-2011, 01:05 AM

In the casino game called High-Low, there are three possible bets. Assume that \$1 is the size of the bet. A pair of fair six-sided dice is rolled and...

• Replies: 1
• Views: 5,079
07-19-2006, 09:20 AM
40. ### Stuck on a problem that should be easy

So this is one of the first problems in our chapter on probability. I'm assuming I am supposed to intuit how to do this, because there are no other...

• Replies: 6
• Views: 5,077
09-19-2006, 02:57 PM
41. ### My probability practise

Hi, I am just trying to improve my probability concepts.. I came across this question.. Just let me know if I am correct? Thanks here is the...

• Replies: 4
• Views: 5,070
BGM
09-08-2010, 04:30 AM
42. ### limits and independent rvs

Let X_1, X_2,... be a sequence of independent r.v.'s with EX_i = miu_i, Var(X_i) = (sigma_i)^2, i= 1, 2,.... Assume that: i) lim n-> inf (...

• Replies: 2
• Views: 5,064
04-10-2009, 08:30 AM
43. ### Help with Binomial & Poisson Distribution!!

Hello forum! I am trying to do complete my homework however I am unsure if I did what was asked correctly for one question and I am having issues...

• Replies: 4
• Views: 5,048
02-25-2011, 12:13 PM
44. ### Confidence Interval HELP Plz

Plz Help!!!!!!! I can't figure this out Confidence interval for the population mean: Use of the t distribution A corporation that maintains a...

• Replies: 1
• Views: 5,038
08-21-2007, 11:13 AM
45. ### Solving probability questions (proofs)

Hi all, I'm sometimes not sure whether I should answer a true/false probability question by using the axioms/formulae, or if I should give a...

• Replies: 1
• Views: 5,035
BGM
05-02-2011, 11:28 AM
46. ### Multinomial Distribution Question

Demonstrate that the multinomial probability mass function sums to 1 for all possible values of y. Demonstrate that the expected value of Y_i =...

• Replies: 1
• Views: 5,027
BGM
10-06-2009, 02:29 AM
47. ### Normality of predictors - negative binomial regression

Hi guys, As a part of my current research project I'm conducting a sequence of negative binomial regressions with counts of crime offences from...

• Replies: 2
• Views: 5,024
03-06-2009, 09:02 PM
48. ### Expectation of random vectors.

Hi there. I'm trying to prove: Cov(X,Y) = E(XY') - E(X)(E(Y))' So i know the cov of 2 random vectors is written by Cov(X,Y) = E can...

• Replies: 9
• Views: 5,021
11-06-2011, 03:27 PM
49. ### Estimating a distribution

Hi, Suppose I had some bags containing a large number of black and white marbles. Each bag has a uniform distribution, but I don't know in advance...

• Replies: 12
• Views: 5,019
08-08-2011, 02:36 AM
50. ### Probability & Food Poisoning

Could the probability of this situation be calculated? Seven of my family members contracted food poisoning. The health department says we must of...

• Replies: 1
• Views: 5,016
11-26-2011, 06:10 PM
51. ### Probability question. Pi = ??

Q: It is noted that 8% of abc students are left handed, if 20 students are randomly selected, calculate Probability that none of them are left...

• Replies: 4
• Views: 5,010
05-19-2014, 02:31 AM
52. ### Four-Sided Die Question

Consider the trial on which a 4 is first observed in successive rolls of a four-sided die. Let A be the event that 4 is observed on the first trial....

• Replies: 4
• Views: 5,008
05-05-2008, 01:12 PM
53. ### Help with basic proportions

The Saloon claims that their pints, on average, are 16 ounces. To test whether the Saloon is actually pouring LESS than 16 ounces (at the .025...

• Replies: 0
• Views: 5,006
10-11-2010, 08:02 PM
54. ### Probability that an exponential variable is greater than poisson.

I need help with one problem in my class, the text is taken directly from the book: The life T (hours) of the lightbulb in av overhead projector...

• Replies: 1
• Views: 5,000
01-30-2008, 03:43 PM
55. ### Chi-Square Test

Hi guys, Was hoping that someone can help me with a Chi-Square test I'm attemtping. I understand the mechanics of the test and how to...

• Replies: 9
• Views: 5,000
06-09-2009, 07:23 AM
56. ### product of N normal distributions

We are given N normal functions, with means \mu_i, and variances \sigma_i^2, i in 1...N. I need to find a formula for the product of the N...

• Replies: 2
• Views: 5,000
08-26-2011, 05:06 PM
57. ### Discrete Probability

Suppose that X is a normal random variable with mean 5. If P{X>9} = 0.2, approximately what is Var(X)?

• Replies: 1
• Views: 4,991
11-04-2007, 07:12 AM
58. ### i need help with this question of probability!

I need help with answering this questions. Suppose that the fills in the soda pop bottle are normally distributed with mean 32.2 ounces and st...

• Replies: 1
• Views: 4,985
10-20-2010, 09:16 PM
59. ### Probability Mass Function

I am given that X follows the geometric distribution and asked to give the probability mass function for X^2. I know that the probability mass...

• Replies: 5
• Views: 4,981
10-08-2010, 11:23 AM

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