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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. I have a probability question!

help please.. I don't know how to find P(x) The BREAKOUT OF FACULTY MEMBERS FROM THE MS&E Divison Suppose that three faculty members are chosen...

• Replies: 12
• Views: 4,058
03-17-2013, 11:07 AM
2. Combine Normal Distributions

How do you combine multiple normal distributions with different standard deviations and means, to produce one representative normal distribution? ...

• Replies: 12
• Views: 20,711
01-26-2013, 12:51 AM
3. expectation of conditional probability

Hi there, I have two questions which I found answers to slightly different version of them in books but not to those that I have in mind so please...

• Replies: 12
• Views: 4,371
BGM
08-25-2011, 02:09 PM
4. Find the constant that makes f(x,y) a probability density function

Let X and Y have a joint density function given by f(x,y) =e^(-kX), 0<=X<inf, 0<=Y<=1, k is a constant, and 0 elsewhere Find the value...

• Replies: 12
• Views: 7,854
10-05-2011, 09:36 PM
5. Dirichlet distribution - moments (mean and variance)

For a Dirichlet variable, I know the means and covariances, that is, E = \alpha_i/\alpha_0 Cov =\frac{ \alpha_i (\alpha_0 I -...

• Replies: 12
• Views: 11,746
02-14-2012, 10:56 AM
6. Two quick problems:

Hey guys, having a bit of trouble and can't find anyone to double check my work: Mean failure rate of a communication is 1 error per 10 000 000...

• Replies: 12
• Views: 2,628
11-06-2011, 11:37 PM
7. [SOLVED] Need help with a problem that I THINK requires Bayes Theorem....

For the combined ELISA-Western blot blood test for HIV positive status, the sensitivity is about 0.999 and the specificity os about 0.9999. Consider...

• Replies: 12
• Views: 6,917
01-28-2012, 03:33 PM
8. Probability for functional combination of normal distributed random variable

Hey folks, i am searching for a method to get the probability of a functional combination of normal distributed random variables, here is an...

• Replies: 12
• Views: 3,583
02-27-2012, 12:43 PM
9. Probability (compound event)

Question: the event A&B are such that P(A)= x+.2 P(B)= 2x + .1 P(AnB)=x a) Given that P(AuB)= .7 find the value of x OK I DON'T EXPECT ANYONE...

• Replies: 12
• Views: 2,682
02-27-2012, 07:56 PM

This is one concept I cannot understand. I'm studying for a test and loathe the probability chapter. Here is the problem and I following all of the...

• Replies: 12
• Views: 5,510
04-15-2012, 06:45 AM
11. E(X) , Cov(aX,bY)

Let X and Y be random variables with the density f(x) such that f(X)=1 for 0<x<1 and f(x)=0 for x<0 and x>1. We have that Var(x) = Var(Y). 1)...

• Replies: 12
• Views: 14,119
04-24-2012, 08:52 PM
12. Polyp probability

some help would be greatly appreciated, this should be easy for people here, but unfortunately i am bad with this stuff. 15 polyps are discovered...

• Replies: 12
• Views: 2,431
06-27-2012, 12:15 AM
13. Sampling Distributions help

Hi, I'm teaching myself stats but have no idea on how to solve these, any help would be appreciated. When a pizza restaurant’s delivery process is...

• Replies: 12
• Views: 1,722
11-26-2012, 11:07 AM
14. Radio Competition - HELP NEEDED!

Hi, I'm a producer on a big (US) Radio station. I'm developing a new competition, but I need help with the probability... The game is simple...

• Replies: 12
• Views: 2,024
05-30-2013, 04:12 PM
15. Balls in a jar

I wonder if my approach to this is correct- Say I have a jar with 10 balls, 9 of which are green and 1 that is red. I start taking out a ball at a...

• Replies: 12
• Views: 3,018
08-27-2013, 11:14 AM
16. Probability of selecting two different colored balls

Given an urn with x red balls, and y green balls, thoroughly mixed, what is the probability of choosing two colors in the first two picks, when the...

• Replies: 12
• Views: 2,823
BGM
02-25-2014, 10:20 PM
17. Number serviceable at given time

If I have 50 systems each operating 400 hours per year with an MTBF of 900 hours how do I calculate how many would be serviceable at one time?...

• Replies: 12
• Views: 2,548
07-28-2014, 08:40 AM
18. Convergence

If Z_n = \frac{1}{n}*\sum_{i=1}^nX_i^2 where X_i=N(\mu,\sigma^2) 1) Show that Z_n \rightarrow^p \mu^2+\sigma^2(convergence in probability) I...

• Replies: 12
• Views: 2,198
12-06-2014, 10:46 AM
19. Help solving probability scenario

I play in a pool league and 4 of my teammates and I were busy practicing when we happened across an interesting scenario: Between 5 of us we...

• Replies: 12
• Views: 2,261
03-17-2015, 06:29 AM
20. Random numbers

Hello, let me go direct to point: Let's say i have a total of 60 numbers (1-60) and i can generate 6 random numbers among them, in this case: 5,...

• Replies: 12
• Views: 2,229
07-22-2015, 08:00 AM
21. False positives

Hi everyone, This is my first post and had a basic (I think) question. Are false positives by definition a conditional probability? I was...

• Replies: 12
• Views: 2,045
08-14-2016, 01:38 AM
22. Calculating z value/mean and standard deviation

Hi...have completed my assignment (and have come a long way with some helpful tips on this forum) but am stuck on one problem: In grading apples...

• Replies: 11
• Views: 42,517
01-07-2006, 10:22 PM
23. 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
24. Cossing Toins-Probability

If I toss 10 coins, how do I find the probability that 8 of them will land on heads? Could someone help me out?

• Replies: 11
• Views: 2,972
10-08-2008, 10:14 AM
25. Samples from uniform distributions

L.S. For an internship I'm stuck with a nasty, statistical problem, so I decided to join this forum and let you guys have a go at it. Evidentily...

• Replies: 11
• Views: 3,030
09-08-2009, 12:14 PM
26. I'm a pure mathematician. HELP!

Hi, As the title says I'm a pure mathematician. Sorry for the non specific title of the thread, I don't know what the following problem should be...

• Replies: 11
• Views: 3,760
BGM
09-18-2009, 12:30 PM
27. count of integers in sliding window

Hi all, I'm looking to generate a series of integers in the range , that start off with a large spacing, like 2 50 101, etc. At a peak of some...

• Replies: 11
• Views: 5,629
02-26-2010, 06:29 AM
28. Bayesian kills me

I have been practicing this Bayesian thing as you can tell.. so here I have made another attempt to get my concepts clear, If the pre-test...

• Replies: 11
• Views: 3,858
09-23-2010, 12:54 AM
29. Cumulative distribution help.

Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

• Replies: 11
• Views: 5,977
10-11-2010, 06:25 PM
30. help me please

Hello, I would like to know if someone can help for the question as below? Suppose that P(E) is 0 or 1, show that E is independent of all...

• Replies: 11
• Views: 3,844
11-01-2010, 12:25 PM
31. help with dirichlet distribution

I am stuck on this problem I have to prove its a density I can do it by show it by integrating it twice with respect to X2 and X1 and it...

• Replies: 11
• Views: 3,911
10-31-2010, 06:15 PM
32. Dependent or Independent

Hello, I am asked the following in an assignment: Let A be the event that a letter picked at random from a piece of English text is T and let B...

• Replies: 11
• Views: 4,655
11-03-2010, 12:57 PM
33. Simple Question

Hi all, I got stuck with a simple question. Thanks in advance for your response. The question is: X_i 's follow i.i.d standard normal rvs. ...

• Replies: 11
• Views: 2,861
BGM
07-26-2011, 11:36 AM
34. Why can't t/(1-t) be a moment generating function for a R.V?

Hi there, having a bit of trouble with this one: Explain/show why there can be no random variable for which Mx(t) (moment generating function) = t...

• Replies: 11
• Views: 9,620
BGM
09-15-2011, 03:08 AM
35. Third Moment about the mean

Let E=μ4 S=/σ^3, where E(X-μ)^3=E(X^3)-3+2^3 How can I rewrite the right hand side of the above expression in terms of μ, σ^2, S and μ4. ...

• Replies: 11
• Views: 8,710
BGM
10-17-2011, 12:06 AM
36. Joint Probability Issues

I'm trying to prepare for a test and going over some practice problems I just found with no solutions, and they've basically led me to believe I'm...

• Replies: 11
• Views: 3,013
12-02-2011, 09:53 AM
37. Binomial probability

Hello!! My question is: Only 30% of the people in a large city feel that mass transit system is adequate. If 20 different persons are selected at...

• Replies: 11
• Views: 4,142
03-10-2012, 06:57 PM
38. Hopefully Simple Question

I've been out of school too long to remember how to do this but, my friend, a principal had brought up an interesting convo about some of his...

• Replies: 11
• Views: 3,692
05-02-2012, 03:11 PM
39. Stuck on Algebraic Proof

Hi, I am trying to algebraically prove the following statement: (n-k+1) ((n) c (k-1)) = k ((n) c (k)). The following are the steps I have down on...

• Replies: 11
• Views: 2,676
09-10-2012, 07:00 PM
40. Question Involving Both a Die and Coin

Hi, I am having difficulties with this probability question and would love some feedback to see if I am thinking this through correctly: “A die...

• Replies: 11
• Views: 2,605
09-12-2012, 08:41 AM
41. 2 statistical bioresearch problems

Hello guys, I require your help in my research project. Problem 1: We are filtering a suspension of 1ml containing 1250 cells, through a...

• Replies: 11
• Views: 2,762
09-25-2012, 02:54 PM
42. Finding probability of left and right handed people

Hello, I am lost on these problems: Assume that 13% of people are left-handed. If we select 10 people at random, answer the following questions: ...

• Replies: 11
• Views: 8,977
10-02-2012, 10:29 AM
43. Proving an assertion on sigma-algebras

Hi there :) I have a problem with solving this question: If \mathcal{A} is a \sigma-algebra defined on \Omega and B \subset \Omega is an...

• Replies: 11
• Views: 1,773
11-04-2012, 11:35 PM
44. Poisson Distribution Help

Hey, I need some help with the following exercise (big test on Sunday). Q: A lab researching cancer cells found that transformed epithelial...

• Replies: 11
• Views: 2,239
BGM
10-01-2013, 11:33 AM
45. Odds & Probabilities

My 8 year old grandson is fascinated by the NFL playoffs. We were looking at a website that showed the odds of winning the Super Bowl for each of 12...

• Replies: 11
• Views: 1,953
01-08-2014, 04:29 AM
46. a question about discrete RV

hello, I have a question about discrete RV. Five fair coins are tossed. The coins that fall on "Head" are removed and the rest of them are tossed...

• Replies: 11
• Views: 1,687
08-08-2014, 07:38 AM
47. Brain Teaser

It's here:http://www.braingle.com/palm/teaser.php?id=29228&comm=1 I thought that surely the answer must be 0.5 until I considered writing a test...

• Replies: 11
• Views: 3,243
09-08-2014, 11:43 PM
48. Probability of k pairs of birthdays in a group of n people

Could somebody please tell me the formula for computing the probability that exactly k pairs will have the same birthday out of a group of n people? ...

• Replies: 11
• Views: 3,460
12-02-2014, 10:24 AM

First off, let me say I know very little about math and even less about probabilities. I am a father of two teenage boys. One of them gave me a...

• Replies: 11
• Views: 2,159
12-23-2014, 05:42 PM
50. Probability to win

Hello, I would like to calculate the probability to win 3 times in a lottery considering the following: 1 - the chance to win 1 time is 1 in...

• Replies: 11
• Views: 1,604
05-25-2015, 01:54 PM
51. Help Settle and Argument re: Chance of Failure in Fantasy Football

Hi, all! I'm new, so please accept my apologies in advance for... whatever. So here's the question. In a fantasy football league, there are...

• Replies: 11
• Views: 1,691
08-25-2015, 12:16 PM
52. Why doesent MLE equal in normal distribution when mean = variance?

Sadly I´m not familiar with LaTex so I have attached my question as a picture. I have tried the best I can, but now I´m stuck :(

• Replies: 11
• Views: 1,853
03-12-2016, 01:24 AM
53. Poisson Distribution Question

I am using the Poisson distribution model the determine the probability of an event occurring. I know that the mean of the event occurring is 7. ...

• Replies: 10
• Views: 7,303
11-01-2005, 12:17 PM
54. stuck on probability

I'm just about done my 2nd assignment and find when I stay at it too long I start to space-out on some of even the more seemingly easier items. I...

• Replies: 10
• Views: 4,787
11-07-2005, 05:48 PM
55. Please Help! I am really stuck on some problems....

During the past forty years, the monthly rate of return of stocks has been approximately normally distrubuted, with u=0.75 percent and sigma=4.2...

• Replies: 10
• Views: 4,522
11-14-2005, 11:34 AM
56. help with probability questions

HELPPPPPPPPPPPPPPPPPPPPPPPPPP I am struggling with a introductory stats course, and am in need of some free help on some of my questions plse plse...

• Replies: 10
• Views: 6,922
02-05-2006, 10:12 AM
57. Permutations with Duplicates

I have been trying to find information about calculating permutations that include multiple duplicate items, but have only found programming source...

• Replies: 10
• Views: 21,999
10-30-2006, 03:34 PM

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