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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: 30,304
09-30-2005, 09:44 AM
1. ### Comparing the skewness of two smaple distributions

Hi Everyone, I wonder if anyone can help me here. Suppose I have two samples with, say, 100 observations in each, and I am not sure if the...

• Replies: 1
• Views: 3,758
01-04-2011, 10:05 AM
2. ### On estimating an underlying probability distribution

Dear Forum readers! Every now and then our university makes a poll among the students, asking questions like "How good was the lecture" to which...

• Replies: 2
• Views: 4,764
01-04-2011, 10:00 AM
3. ### Show Skewness of a symmetric pdf to be 0

Hi there, I am hoping some of you may be able to help/guide me! I am taking a course in turbulence which has an obvious background in statistical...

• Replies: 1
• Views: 14,134
BGM
01-03-2011, 04:58 PM
4. ### 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: 5,157
BGM
01-03-2011, 10:58 AM
5. ### Distribution function inequality

Prove that 1-\sum_{i=1}^{n}\leq F(x_1,x_2,....,x_n) where F(x_1,x_2,...,x_n) is the joint cdf and F_i(x_i) is the cdf of X_i

• Replies: 0
• Views: 2,842
01-01-2011, 08:15 AM
6. ### National Lottery

Consider these two scenarios and decide which is *better* (better is purposely ambiguous here…). 1. Have one punt at the lottery and purchase 52...

• Replies: 4
• Views: 3,611
12-31-2010, 02:15 PM
7. ### Scrabble Question

Okay, so at the beginning of a scrabble game, before anyone plays any words, everyone draws their 7 letters from the bag. Is there any statistical...

• Replies: 3
• Views: 2,993
12-31-2010, 12:55 PM
8. ### RV distribution with hint

Let x be a RV that counts the number of clients that enter some place. It is initialized to 0 at time 0. The number of clients that enter per second...

• Replies: 4
• Views: 4,268
12-30-2010, 03:55 PM
9. ### Random probability distribution for demand

Hi All, I have a sample of 100 items with a specific daily expected demand probability. Average demand for a day is 4 (without repetition). I have...

• Replies: 10
• Views: 10,275
12-29-2010, 12:22 PM
10. ### Events

Hi Guys, I've got a couple of theoretical questions: 1. If the intersection of events A,B,C is an empty set, is it true that the intersections...

• Replies: 3
• Views: 3,928
12-28-2010, 08:36 PM
11. ### Conditional distribution of transformed variables

Hi, I'll appreciate if someone can help me figure out the following problem: Let \Theta,E_1,E_2 be all real-valued random variables. E_1 and E_2...

• Replies: 1
• Views: 2,927
BGM
12-25-2010, 02:04 PM
12. ### random walk

For a simple random walk, where S_n = X_1 + X_2 + \ldots + X_n, and X_i's are i.i.d with P(X_i = 1) = P(X_i = -1) = 1/2, it's a well-known fact...

• Replies: 0
• Views: 3,000
12-24-2010, 01:14 PM
13. ### How to calculate probability on dice groups.

I'm a game designer studying the probability curves of various dice throwing mechanics. I know some basic statistics but it's been a while since I...

• Replies: 6
• Views: 8,510
BGM
12-23-2010, 02:39 PM
14. ### Standard Deviation from Percentiles and Mean

Hello to all and thank you in advance for the help with this. I am working with a lognormal distribution and am given Percentiles - P10, P50, P90,...

• Replies: 7
• Views: 36,356
12-23-2010, 02:14 PM
15. ### 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: 5,085
12-23-2010, 06:56 AM
16. ### Help needed on probability assignment.

Hi - A test for a disease has been used for many years. Experience with the test indicates that its sensitivity (probability that a person having...

• Replies: 2
• Views: 6,195
12-22-2010, 02:52 PM
17. ### 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: 2,473
BGM
12-22-2010, 12:24 PM
18. ### Help combining probabilities

I am a relative novice concerning statistics and probability, and was hoping for some assistance with this problem. I have a substantial database...

• Replies: 0
• Views: 2,095
12-22-2010, 03:47 AM
19. ### What are the odds?

Hi all, So on a (e.g.) 140-question multiple choice examination, one would expect a score of about 25% if a testees' responses were random. I...

• Replies: 1
• Views: 2,118
12-22-2010, 03:18 AM
20. ### Quartic Exponential Distribution

Thanks in advance for any help. I am working on a model where I have the need to compute the normalization constant for the Quartic Exponential...

• Replies: 1
• Views: 3,285
12-21-2010, 04:13 PM
21. ### Conditional Expectation question

My final is on Mon, and I got this HW problem wrong from last week, and I still don't understand why. An item is selected randomly from a...

• Replies: 6
• Views: 6,325
12-21-2010, 07:11 AM
22. ### Having trouble with conditional expectation problem

Hi all, I have been doing some self studying and have been using some course materials from the University of Auckland. I somehow have gotten...

• Replies: 0
• Views: 2,500
12-21-2010, 06:33 AM
23. ### Combining pdf's for when a task will stop

Hello, I have multiple tasks I want to run in succession, and I need to know at a given time what is the probability that they will both be done....

• Replies: 2
• Views: 2,099
12-20-2010, 06:27 PM
24. ### 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: 5,636
12-20-2010, 02:38 PM
25. ### SOA Exam-P Practice

Anybody studying for the Society of Actuaries Exam-P? I am studying from the practice questions provided on the website. Any good study materials...

• Replies: 2
• Views: 4,196
12-17-2010, 04:58 PM
26. ### Probability problem

Hello, I am a student and still new to statistics and have recebtly found this forum. I have this particular problem to solve and I need help: ...

• Replies: 4
• Views: 2,889
12-17-2010, 04:24 PM
27. ### Probability for 20 people

Hi, I'm not a stats student, I'm a university student reviewing some literature and I'm interested in some of the statistics related to it and how...

• Replies: 5
• Views: 4,404
12-16-2010, 06:55 PM
28. ### Uniform Disk Help Grovel

Let (x,y) be uniformly distributed over x^2+y^2\leq1, the unit disk. 1. Work out an expression for E{X^mY^n} I have found that the marginal...

• Replies: 5
• Views: 3,568
BGM
12-16-2010, 02:44 PM
29. ### Process Capability - Extreme Measurements

Hi All... I am trying to determine the process capability of a plating process (Cu thickness) where we are only able to measure the extremes. ...

• Replies: 0
• Views: 3,006
12-16-2010, 12:39 PM
30. ### Dice Throwing

2 dice thrown together for 3 times, what is the probability that for any of the 3 throws, I will get the same number on both dice? Thx ! Andrew

• Replies: 1
• Views: 3,367
12-16-2010, 08:56 AM
31. ### Conditional Probability Problem

Hello all! I have a probability test tomorrow and have been working through practice problems but I ran into one that is giving me troubles. We...

• Replies: 2
• Views: 3,568
12-15-2010, 08:27 PM
32. ### Membership in group

This is from the Bertsekas Intro Probability book, 1st ed. How do you approach this problem? A class has 4 grad students and 12 undergrad...

• Replies: 4
• Views: 2,643
12-15-2010, 06:39 PM
33. ### Gumbel from exponential

I am working on generating the Gumbel distribution like so... Let X1,X2,..., Xn be iid EXP(1) Let Y=max(X1,X2,..., Xn) Let An be an n-dependent...

• Replies: 1
• Views: 2,876
12-15-2010, 01:55 AM
34. ### Probability question.

I have two probability questions that confuse me even though they sound very easy. Can any one help? "If I decide to give a 20 question...

• Replies: 3
• Views: 2,782
RKO
12-14-2010, 09:22 PM
35. ### Geometric RV

So i have a question... If X is a geometric RV with parameter p (the geometric definition where x=0,1,2,3...) 1. compute the distribution of...

• Replies: 5
• Views: 6,715
12-14-2010, 09:08 PM
36. ### How to find probability in this statistics problem?

We have "N" experiments with YES/NO outcome and in each experiment probability for YES is "p". If in "N-1" experiments we had "m" YES outcomes,...

• Replies: 4
• Views: 3,353
12-14-2010, 12:20 PM
37. ### 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: 2,541
ccs
12-13-2010, 01:59 PM
38. ### 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: 5,325
12-13-2010, 12:27 AM
39. ### question about a normal distribution probability homework

hello everyone ; glad to be here with you :D i hope you'll help me to resolve this problem exercise : we inform you that's 84,13% of the...

• Replies: 8
• Views: 4,488
12-12-2010, 06:14 PM
40. ### Indicated probability

Assume that X has a normal distribution, and find the indicated probability. The mean is μ = 15.2 and the standard deviation is σ = 0.9. Find the...

• Replies: 1
• Views: 7,780
BGM
12-12-2010, 03:16 PM
41. ### Binomial Distribution help

Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of...

• Replies: 2
• Views: 8,497
BGM
12-12-2010, 02:03 PM
42. ### 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: 4,014
12-12-2010, 01:15 PM
43. ### Possion question

Hey guys, i have my final next week and i been studying for it. i been doing the question in the book, but i there is a questions that i really do...

• Replies: 5
• Views: 3,252
12-10-2010, 10:13 PM
44. ### Marbles ()

Suppose that we have a very large collection of marbles, 30% of which are red, 20% of which are green, 40% of which are blue, and 10% of which are...

• Replies: 0
• Views: 1,989
12-10-2010, 01:28 PM
45. ### 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: 5,369
12-09-2010, 11:00 PM
46. ### Simpson's paradox question!

Ok guys so the question goes like: A company ABC makes 2 drugs --> Drug A & Drug B Drug B has a higher success rate when given to both men and...

• Replies: 2
• Views: 3,439
v10
12-09-2010, 10:03 PM
47. ### Familywise Type II error rates

There is a lot in the literature on familywise Type I errror rates but no explanation of familywise Type II error rates. If familywise rates remain...

• Replies: 0
• Views: 2,743
12-09-2010, 03:14 PM
48. ### Probability of getting your umbrella back

This problem took me a while to figure out. Thought I'd post it up to see if other members would get it quicker than I did. A party has n guests,...

• Replies: 1
• Views: 4,122
12-09-2010, 12:08 PM
49. ### Probablity

Hi Suppose there are 2000 capsules from Manufacturer A, 3000 capsules from Manufacturer B, and 1000 capsules from Manufacturer C. Each...

• Replies: 4
• Views: 3,590
12-09-2010, 12:08 PM
50. ### Random variable

Suppose that we have a very large collection of marbles, 30% of which are red, 20% of which are green, 40% of which are blue, and 10% of which are...

• Replies: 2
• Views: 3,957
12-09-2010, 11:41 AM
51. ### Help with Probability!

Hi. I came across a few questions tht i came across while studyin for a probability chapter. Just a little request, im very new to probability so u...

• Replies: 5
• Views: 19,010
12-09-2010, 10:41 AM
52. ### Probability of measuring points

Dear all I would like to ask a question from 'real life'. We are manufacturing pieces which will be assembled togehter for later use. between...

• Replies: 0
• Views: 3,155
12-09-2010, 02:04 AM
53. ### Probability of a combination of two separate outcomes, without replacement

All I am stumped with this one, best way to describe the problem is as follows; Suppose you have 10 red marbles, 10 blue marbles, 10 green...

• Replies: 1
• Views: 4,033
BGM
12-08-2010, 11:59 PM
54. ### Combination permutation

Suppose that from a class of students (of whom 14 are male and 16 are female), a committee of 10 students is chosen at random. The committee then...

• Replies: 0
• Views: 3,283
12-08-2010, 11:23 AM
55. ### Two part PMF for a Joint Distribution problem

Suppose X and Y have the following joint distribution p(x, y) = c(x^2 + y^2). For x = -1, 0, 1, 3 and y = -1, 2, 4: A) Find the value of c that...

• Replies: 2
• Views: 5,841
12-08-2010, 10:26 AM

1. The following data represent the pulse rates of females: Pulse Rate Frequency 60 - 69 12 70 - 79 14 80 - 89 11 90- 99 1 ...

• Replies: 3
• Views: 3,266
12-07-2010, 09:06 PM
57. ### Probability of the sample Mean

The weight (x) of an adult salmon in Lake Michigan is a normally distributed variable with the mean 5.5 lbs and a standard deviation of 0.5 lbs. An...

• Replies: 0
• Views: 2,447
12-07-2010, 06:11 PM
58. ### limiting distributions?

A club basketball team will play a 44-game season. 26 of these games are against class A and 18 are against class B teams. Suppose that the team will...

• Replies: 0
• Views: 3,777
12-07-2010, 06:08 PM
59. ### 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: 5,404
12-07-2010, 11:26 AM

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