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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: 30,175
09-30-2005, 09:44 AM
1. ### probability

probability

• Replies: 1
• Views: 1,868
02-10-2017, 08:03 PM
2. ### Scoring at least once out of ten attempts

A football player has the chance of 0.14 to score (single kick). If he kicks the ball 10 times, what is his chance of scoring at least once? Can...

• Replies: 3
• Views: 1,684
02-20-2016, 05:28 PM
3. ### Simple conditional probabilities

Hello, I am currently reading an image processing paper that involves conditional probabilities in one section, but my probability classes are way...

• Replies: 1
• Views: 1,741
BGM
02-15-2013, 12:31 AM
4. ### Confirm my results for me

1. The police confiscated 500 tablets suspected to contain ecstasy. A sample of 15 tablets were sent to the laboratory for analysis. After getting...

• Replies: 1
• Views: 1,604
02-14-2013, 02:45 PM
5. ### Bayes Theorem

I have been doing some problems with Bayes Theorem, but I have one question that is more complex than the others and was wondering if anyone can help...

• Replies: 1
• Views: 3,085
02-10-2008, 08:29 PM
6. ### Noise distribution in multi-variate signal - research question

Hello all, I could use a hand with a question holding up some research. I am trying to calculate the signal to noise ratio on a signal which is...

• Replies: 2
• Views: 1,621
11-13-2013, 11:31 AM
7. ### normal distribution

Please explain me how to do that? What is the probability that a worker at Random drives more that 15 miles to work if the distribution of all...

• Replies: 7
• Views: 2,252
12-03-2011, 05:21 PM
8. ### Extremely Simple Probability Calculation

I am working on a project (non-school, non-homework, math for fun :D) in which I need to determine a fairly simple probability. I need to determine...

• Replies: 5
• Views: 1,193
12-08-2012, 04:22 PM
9. ### percentile for (1 - cumulative distribution function)

Hi, Before addressing my question, please let me define the context: The percentile is usually defined as the value of a variable BELOW which a...

• Replies: 4
• Views: 12,902
01-04-2011, 10:09 AM
10. ### binomial distribution with random p?

I haven't much training in statistics or math in general, but I was playing around with a signalling model I'm building, mostly for fun, and ran into...

• Replies: 2
• Views: 2,997
12-08-2008, 11:42 PM
11. ### Probability Brain Teaser

You have 6 pairs of socks - 2 white, 2 black, 2 green You need a matching pair in either white or black - but the lights are out, so you have to...

• Replies: 3
• Views: 1,416
11-12-2012, 10:00 PM

Find the stationary distribution for a markov chain with two states 1,2 and 0 < P11 = a < 1,0 < P22 = b < 1. Use the balance of flows to and from...

• Replies: 0
• Views: 2,709
12-04-2007, 12:47 PM
13. ### Probability Question

A billion thanks to anyone who can help me with this problem: Let's say that there is a deck of only six cards labeled A through F And each...

• Replies: 0
• Views: 1,850
02-11-2008, 08:29 PM
14. ### should bayes therom be used?

Seems like a relatively simple question, but I'm missing it: There are 25 delinquent accounts in 100 accounts. If I choose 75 accounts out of the...

• Replies: 2
• Views: 1,241
05-15-2016, 06:41 AM
15. ### Probability of rolling a 1 10% or less over # of trials?

Hey guys, It's been years since I've taken a stats class and just need a refresher on how to calculate a problem of this form. Specifically, I'm...

• Replies: 0
• Views: 3,158
11-14-2007, 12:11 AM
16. ### Lottery 'week intervals'

This strikes me as an interesting (though potentially tricky) lottery question that I'm having trouble getting my head around. Many state...

• Replies: 0
• Views: 2,011
07-29-2012, 12:36 AM
17. ### Different Interpretations of the Central Limit Theorem

My friend and I are having an argument about the meaning of CLT. It led to me build this javascript experiment which you may enjoy:...

• Replies: 2
• Views: 3,283
06-18-2013, 07:33 PM

Hi, I'm having trouble with a homework problem and I was wondering if someone could walk me through it a bit. Alex and Yan agree to meet at the...

• Replies: 1
• Views: 1,397
05-14-2012, 12:19 AM
19. ### Help!!!

I have two questions from an assignment that are stumping me. Although I'm sure they're simple this is an online summer class and the professor isn't...

• Replies: 3
• Views: 3,677
06-01-2007, 08:14 AM
20. ### Need help for interpreting the simulation results...

Hi all, I performed a simulation study on R for bootstrap, permutation and classic version of hotelling T^2 test, Goodall F , and James T test ...

• Replies: 0
• Views: 2,142
01-11-2011, 08:24 AM
21. ### how to find MGF ?

E(X^r)=(r+1)!* (2^r). we have to find MGF of random variable X.

• Replies: 0
• Views: 1,742
06-29-2015, 02:38 PM
22. ### Incidence rate in population and in random sample

How can I anser a question like the following: When the true incidence rate of an event in the population is "X" (say, 12%), how likely is it that...

• Replies: 1
• Views: 1,032
08-25-2016, 04:16 PM
23. ### 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: 1,686
08-08-2014, 07:38 AM
24. ### Probability confusion

Hi guys, I have a question here. I understand the reasoning behind the solution, but I am also wondering about why an alternative solution is not...

• Replies: 3
• Views: 3,378
BGM
04-13-2010, 09:14 PM
25. ### ARL - U Chart using poisson tables?

How do you determine the average run length of a u-Chart when process is im control using Poisson tables???

• Replies: 0
• Views: 2,096
11-27-2008, 10:58 AM
26. ### When does the Normal Distribution arise?

Hello guys, Studying the multivariate normal distribution (and the univariate one as well), I found in Muirhead (1982) that the normal distribution...

• Replies: 1
• Views: 2,271
11-23-2014, 05:19 PM
27. ### HELP studying for a FINAL EXAM

Hello everyone, I have a final that I am studying for, the final isnt till thursday. But I am having problems soving some probability problems, I...

• Replies: 0
• Views: 2,530
03-20-2006, 06:39 PM
28. ### MGF, Moment-Generating Function

Let X1 and X2 be two independent random variables. Let X1 and Y = X1 + X2 be χ2(r1) (Chi Square) and χ2(r), respectively, where r1 < r. (a) Find...

• Replies: 4
• Views: 1,482
BGM
01-31-2015, 04:58 PM
29. ### Bernoulli distribution and PGF

let Yi,j be independent Bernoulli random variables with E = 1/j. Let Zj = sumYi,j for i=1 to j . Let MZj(s) be the probability generating function...

• Replies: 6
• Views: 2,313
02-12-2015, 01:37 PM
30. ### Exponential Distribution with uniform random variables

I choose Θ according to the exponential distribution with mean 1. I then choose 10 i.i.d. random variables X1, . . . , X10, where each Xi has...

• Replies: 2
• Views: 1,980
BGM
02-11-2015, 11:42 PM
31. ### Calculating the expected value

Hi, I have a strange problem. Following info is provided: Event insurance comp. allows promoters of any event to protect themselves from financial...

• Replies: 1
• Views: 3,451
BGM
05-26-2010, 01:57 PM
32. ### probability from moment generating function?

if the moment generating of a random variable X is M_x(t)=(1-t)^-2 compute P(-2 < X < 3) or explain why it cannot be computed how do I do...

• Replies: 4
• Views: 6,509
04-10-2009, 08:27 AM
33. ### 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: 5,011
04-10-2009, 08:30 AM
34. ### uniform random variables, max, sequence

-qn solved-

• Replies: 0
• Views: 2,085
04-10-2009, 08:45 AM
35. ### 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: 5,075
a^2
02-07-2008, 11:01 AM
36. ### Normal Average versus Weighted Average

I'm taking a self-study course from "The Great Courses" called "Joy of Numbers". I'm on the lesson "Joy of Mathematical Games" and am confused by the...

• Replies: 1
• Views: 945
10-29-2015, 02:07 PM
37. ### probability problem.. help?

I have a question using the uniform probability where c=4 and d=10 Find k where P(2≤X≤k)=0.6 so (k-2)(1/6)=0.6 k-2=1 k=3 correct? TIA!

• Replies: 1
• Views: 4,876
04-27-2008, 10:23 PM
38. ### Discrete Random Variables

Its asking to complete the chart. Since its probability I added it up to have a one but the other chart has a negative does that mean that it can't...

• Replies: 4
• Views: 3,253
07-12-2010, 09:10 PM
39. ### Mutually Exclusive

I can't seem to remember how to determine what P(A|B) is if the two events are determined to be mutually exclusive with probabilities P(A)= 0.3 and...

• Replies: 2
• Views: 2,487
08-10-2010, 04:41 PM
40. ### Probability of sum of 6 digit number

Hi, What is the probability of sum of any 6 digit number (ranging from 000000 to 999999) to be equal to 12. Actually I am looking for the...

• Replies: 6
• Views: 3,910
BGM
06-14-2013, 01:42 PM
41. ### 7 Balls in 7 Buckets

Hi, Say I have 7 balls I can put in 7 different buckets. Define Xn to be the number of buckets with n balls. For instance X3 = 1 is the number of...

• Replies: 0
• Views: 1,144
07-24-2013, 11:10 PM
42. ### Problem of ball & buckets (# balls, # buckets and # max. capacity per bucket)

I need to resolve the following problem: There are 6 buckets and each bucket can hold a maximum of 16 balls (it could be 0 to 16 balls with equal...

• Replies: 0
• Views: 3,716
01-05-2011, 11:54 PM
43. ### multiplication rule with two random events?

Exercise from mathint.com: "The probability that a student passes Mathematics is 2/3 and the probability that he passes English is 4/9 . If the...

• Replies: 1
• Views: 102
10-06-2017, 03:41 PM
44. ### Probability Density Function of the derivative of a stochastic process

Dear all; What is the expression of the PDF of the derivative of a stochastic process? My problem is completely general and theoretical, so, let's...

• Replies: 0
• Views: 1,478
08-31-2015, 06:45 AM
45. ### Do u know a statistical distribution with exponential moment generating function

Hi When I involve with a problem about limiting distribution of Gama, I encounter with below moment generating function:...

• Replies: 1
• Views: 1,031
BGM
10-19-2012, 03:00 AM
46. ### Conditional probability density function, practical example

Greetings to all the ones who are accepting to help people and greeting to the ones who are browsing in the forum! We have 2 independent random...

• Replies: 2
• Views: 4,813
10-03-2012, 03:07 AM
47. ### Need Help on Prob

You are given three coins and told that two of them are biased and that they both have a 60% chance of coming up heads. The third coin is fair. You...

• Replies: 2
• Views: 2,638
03-18-2008, 09:09 AM
48. ### Probability Problems

Hello can someone verify if I am correct for these problems? A small package of alphabet soup noodles contain 3 A’s, 3 B’s and 3 C’s. You...

• Replies: 1
• Views: 2,934
05-15-2008, 06:57 PM

Hi everyone, I m new to stats and I m stuck with this two question for 2 hours now...I ll be really appreciate if someone here could show me how to...

• Replies: 2
• Views: 6,850
02-06-2011, 02:17 PM
50. ### Probability model on common cold

Here is a probabilistic model for the spread of the common cold. We have two people in a room, one of them healthy, and immune, the other sick....

• Replies: 0
• Views: 2,314
11-13-2008, 10:33 PM
51. ### Simple Probability problem

Hello, First time user, long time visitor. I am hoping someone can and is willing to help me. I am stuck on this two part problem. It seems...

• Replies: 3
• Views: 2,174
09-23-2012, 11:49 AM
52. ### Basic Probability Problem...

A container has 20 green & 30 red balls. Five balls are randomly drawn with replacement. Let x be the number of green balls drawn. Find the...

• Replies: 2
• Views: 1,995
05-03-2011, 07:05 AM
53. ### Please, help with conditional probability

You play with 2 opponents with whom you alternately play with probability p_A and p_B. p_B >= p_A. We want to minimize the number of games you...

• Replies: 0
• Views: 2,617
08-23-2009, 04:23 PM
54. ### null hypothisis and p value

This is my question; A medical Researcher knows that the generally accepted level for Triglycerides in Adult Males is 110 mg/dl. Fearing that men...

• Replies: 5
• Views: 2,547
04-02-2012, 03:45 PM
55. ### Numerical frequency analysis query

Hi, I heard about this on radio 4 (UK) back in 2007. A statistical method whereby the frequency of integers in a dataset is calculated, then...

• Replies: 0
• Views: 2,413
03-08-2010, 07:52 AM
56. ### Probability of new lottery

Hi everyone, I come from the Czech Republic and I received a business case at work. I am supposed to come up with a new lottery which would be a...

• Replies: 3
• Views: 2,509
BGM
10-01-2011, 03:07 PM
57. ### Probability of event

Hello Friends I'll try to ask in very simple way I will have multiple choice test next month and i have 240 questions every question has 3...

• Replies: 7
• Views: 3,521
03-08-2011, 02:06 PM

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