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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: 30,322
09-30-2005, 09:44 AM
1. ### Sum of Poisson Distribution

Hi everyone. Let X and Y be independent, with X~Poi(lambda) and Y~Poi(mu). Put Z = X + Y as their sum. Find the distribution X | Z = z.

• Replies: 8
• Views: 19,429
02-13-2012, 07:50 PM
2. ### help with 2 r.v. normal distribution problem

Hi all, so my question has to do with 2 r.v. and normal distribution. X: mean = 5000, standard deviation = 100 Y: mean = 5200, standard...

• Replies: 8
• Views: 5,571
04-06-2010, 08:54 PM
3. ### Figure out if there is any statistical significance

Hi - I have some data on the internal temperature of cooked meat. The meat patty is a failure if the temperature obtained is below a certain...

• Replies: 8
• Views: 11,649
06-10-2010, 01:27 PM
4. ### Simple probablility question

A closet contains 8 pairs of shoes. If 4 shoes are randomly selected, what is the probability that there will be no complete pair? So i know that...

• Replies: 8
• Views: 8,064
06-08-2010, 05:53 PM
5. ### Writing a book - need help!

I am writing a book on double deck pinochle and need to get accurate percentages. I am hoping this forum is willing and able to help me! If I am in...

• Replies: 8
• Views: 3,984
BGM
08-05-2010, 12:21 AM
6. ### Hypergeometric distribution problem

A purchaser receives small lots (N = 25) of a high precision device. She wishes to reject the lot 95% of the time if it contains as many as seven...

• Replies: 8
• Views: 6,709
09-13-2010, 02:49 PM
7. ### unfair coin problem

im stuck with a part of a problem which is : An unfair coin (p{h}=p=0.6) is tossed n=20 times. FIND the probability that the number of heads k is...

• Replies: 8
• Views: 6,642
09-14-2010, 01:46 AM
8. ### random variables

compute xbar=integral xf(x)dx for the continous distribution: exponential:f(x)=u(x)lambda e^-lambdax. compute x^2bar

• Replies: 8
• Views: 3,792
09-18-2010, 02:38 AM
9. ### Probability Distribution

The time (in hours) it takes before belts X and Y need replacing in a high use machine follows the joint probability distribution: integral y/100*...

• Replies: 8
• Views: 4,085
BGM
09-22-2010, 01:01 PM
10. ### System of 5 independent components

I have done problems similar to this one with 4 components but im getting stumped with this one. The probability of FAILURE for each components is...

• Replies: 8
• Views: 4,437
10-12-2010, 09:25 AM
11. ### A little help with distributions

I have been assigned a project that involves statistics and i have no idea about it. I was suppose to capture online game traffi and then using the...

• Replies: 8
• Views: 3,435
10-18-2010, 01:07 PM
12. ### Cumulative Distribution Function

Please help me, I have 2 cases: 1. n is positive constant and defined by function f(x)=1/2.n.e^(-n.x) if x>=0 and f(x)=1/2.n.e^(-n.x) if x<0....

• Replies: 8
• Views: 10,207
10-26-2010, 01:37 AM
13. ### CDF problem

Problem - Let X be a random variable with c.d.f. F(x). Find the c.d.f. of aX + b first for a > 0, then for a < 0. (for a > 0) F(x) = P(X <= x) ...

• Replies: 8
• Views: 8,094
11-02-2010, 04:24 PM
14. ### question about independent variables

Hi, all – So, my daughter just came to me with a homework problem. She already has the answer from the back of the book, but doesn't understand...

• Replies: 8
• Views: 2,930
12-06-2010, 11:14 PM
15. ### 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: 4,498
12-12-2010, 06:14 PM
16. ### Independence of Bivariate Continuos RV's.

By the two definitions of independence for bivariate continuous RVs: (1) F(x,y)=F_X(x)F_Y(y) and (2) f(x,y)=f_X(x)f_Y(y). Prove that these two are...

• Replies: 8
• Views: 3,568
01-30-2011, 11:44 PM
17. ### Lottery probability. What if a friend wins?

As a programmer I've worked a little bit with statistics, but not much with probability. An interesting question has come to mind this week, and it...

• Replies: 8
• Views: 5,701
03-03-2011, 04:53 PM
18. ### What is the chance to have a mutual friend with a random person ?

We have a social network say facebook. We know that it is composed by 500 milion of users. We know that each user have an average of 135 friend. ...

• Replies: 8
• Views: 9,979
09-02-2011, 06:35 PM
19. ### what test shoud I use?

hi! I have a problem, I don't know which test should I use... So here it goes: Let's assume we are observing a population of students on a...

• Replies: 8
• Views: 3,062
03-20-2011, 09:10 AM
20. ### Probability of a player winning a best-of-n contest with a given current scoreline...

Many sports are played over a best-of-n format, where the first player to reach a specified number games won wins the overall contest. An example...

• Replies: 8
• Views: 4,791
01-16-2012, 10:24 AM
21. ### finding MLE

f(x,y)=\frac{\theta}{4}, if (x,y)=(0,0),(1,1) =\frac{2-\theta}{4}, if (x,y)=(0,1),(1,0) Find MLE of \theta where 0\leq\theta\leq 2

• Replies: 8
• Views: 4,384
05-13-2011, 08:05 AM
22. ### Probability Question

This is not for homework or class. Only research can make me post such a specific question. I've tried different things, and searched a lot online,...

• Replies: 8
• Views: 3,588
06-18-2011, 06:15 PM
23. ### probability question

a council of a town consist of 5 members: Member Gender 1 M 2 M 3 F 4 F 5 ...

• Replies: 8
• Views: 2,078
BGM
06-24-2011, 07:56 AM
24. ### six digit no.

a no. of six digit is written down at random. the probability that the sum of the digit of the no. is even is

• Replies: 8
• Views: 3,222
BGM
07-30-2011, 03:15 AM
25. ### Need a Probability Answer

hello , i read a bit from the forum and i saw that i still do not have a answer to my propability question. The situation is like this How to...

• Replies: 8
• Views: 4,944
08-21-2011, 03:57 PM
26. ### Probability Help.

Im not sure why I can't figure out these 2 problems. I got the first one right, and I'm using the same thought process to do the other 2, I just...

• Replies: 8
• Views: 10,559
06-15-2012, 06:22 PM
27. ### Conditional Probability

In order to be qualified for a job, a candidate need to pass 3 exams. If a candidate fail an exam, he can't take the next one. A random candidate...

• Replies: 8
• Views: 3,087
12-06-2011, 08:13 PM
28. ### What distribution is this?

Hi, Looks like a nice forum here, hope you guys help me with this question, this is not a homework one since I am a coder, need to verify it for my...

• Replies: 8
• Views: 3,036
01-13-2012, 05:54 AM

the time it takes for me to reach the university from my home has a normal distribution with mean 45 minutes and standard deviation 15 minutes. I...

• Replies: 8
• Views: 2,573
01-18-2012, 01:30 AM
30. ### coin toss

I have a coin that lands heads with probability p1; you have a coin that lands heads with probability p2. I toss my coin until I get a head. Each...

• Replies: 8
• Views: 3,450
02-26-2012, 05:35 AM
31. ### Probability question:??

If I have 2 coins the first coin is a fair coin and sec one is two head. I randomly pick one and toss it twice, the result are both head for two...

• Replies: 8
• Views: 2,375
02-29-2012, 06:09 PM
32. ### Bayesian vs. Frequentist

Hi, I am a college student who has taken a course in frequentist probility learned a little bit of Bayesian probability. I don't know enough to...

• Replies: 8
• Views: 4,485
07-03-2012, 03:43 PM

I been trying to figure this out for so long, i just dont get it. if anyone can explain the answer it'd be very much appreciated. A box of 100...

• Replies: 8
• Views: 2,209
05-12-2012, 01:37 AM
34. ### Die probabilistic

i am reading Mostellers book on 50 difficult probability questions. the question I am struggling with is on the average, how many times must a die be...

• Replies: 8
• Views: 1,951
08-02-2012, 04:57 PM
35. ### How many different combinations can a user make?

I would like to figure how many different ways a report can be filtered. The report shows how many different units were sold. Filter 1: Allows...

• Replies: 8
• Views: 4,045
08-20-2012, 08:55 PM
36. ### Sampling Probability Question

Hi Folks. i have a probability question. Actually, it's more of a sampling question. I have a population that contains 6 different conditions. ...

• Replies: 8
• Views: 1,713
09-05-2012, 06:05 AM
37. ### Probability help solving problem

A hopeful TV Talent Show contestant claims to be able to predict the result of tossing a coin. To check this out, a fair coin is flipped 24 times,...

• Replies: 8
• Views: 2,151
09-29-2012, 02:24 PM
38. ### Probability Question

Hi I have tried tooth and nail to try and get this question done but cant seem to solve it. I have just started university and am coming to terms...

• Replies: 8
• Views: 2,016
10-20-2012, 05:23 AM
39. ### Uniform Distribution with Convergence

I am trying to Prove that {Wn} converges in distribution to W. Wn has the following density: (1 + x/n) / (1 + 1/2n) In essence, I am trying to...

• Replies: 8
• Views: 1,881
10-16-2012, 02:32 AM
40. ### R^2=0

How can I show that R^2 can be equal to or less than zero? I can't find an example.

• Replies: 8
• Views: 2,182
11-02-2012, 12:48 AM
41. ### Duplicate sample probability

I have a population of N unique items, and I take n random samples (with replacement, so some items may be sampled more than once). If I then take...

• Replies: 8
• Views: 4,481
11-28-2012, 07:37 AM
42. ### moment generating functions

Stuck on homework question: I need to show the m.g.f. of an exponential distribution is: M_x(t)=\frac{\beta}{\beta-t} for t<\beta First i...

• Replies: 8
• Views: 2,004
01-19-2013, 07:39 AM
43. ### Probability Question from Boss

We received this question from our boss, he said there would be a prize to the first person to answer it. I submitted my response and he said I was...

• Replies: 8
• Views: 1,294
03-14-2013, 09:59 AM
44. ### Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms.

Wigan V City Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms. Please advise how to proceed with this question...

• Replies: 8
• Views: 1,929
01-14-2013, 06:46 PM
45. ### The sample covariance matrix is ALWAYS nonsingular... Right?

Just checking... I mean, with the exception of some peculiar cases (e.g. one variable is a linear combination of other ones present), there is no...

• Replies: 8
• Views: 9,249
05-03-2013, 01:27 PM
46. ### Probability help

Hello! I am a complete novice with all things related to statistics and/or probabilities (as my name suggests). I need to answer this question for a...

• Replies: 8
• Views: 2,253
02-24-2013, 11:16 PM
47. ### Finding UNcondintional Mean and Variance of U

Good evening! I am working through this problem and searched online and found the solution, which makes a lot of sense, but am not quite sure...

• Replies: 8
• Views: 5,954
02-03-2013, 09:43 AM
48. ### Use Normal Distribution and Chi-square distribution

My question is as follows: If X and Y are independent random variables, X has a normal distribution with mean 2 and variance 4, and Y has a...

• Replies: 8
• Views: 1,963
03-08-2013, 01:41 AM
49. ### Need help figuring this out...

Three gentlemen, Prof. Plum, Mr. Green, and Col. Mustard, have offended each others' honor. They will settle their dispute with a duel truel with...

• Replies: 8
• Views: 2,465
05-24-2013, 10:26 PM
50. ### Binomial probability

A number of trials were run with a high success rate, n = 1700 & 99.9% success How can I calculate (with 95% confidence) the lowest probability of...

• Replies: 8
• Views: 1,881
05-15-2013, 06:24 AM
51. ### Show that a stochastic variable is allmost this expression.

Hi We have a binomial situation where the p value is: p=\frac{2}{a}, our end goal is to find an estimator for a, and an estimate for this...

• Replies: 8
• Views: 1,670
06-09-2013, 11:05 AM
52. ### Outcomes of coin toss with restrictions?

Hey guys, Apologies if this is in the wrong area. I'm busy with a non academic project at the moment, and I need to determine the number of...

• Replies: 8
• Views: 2,191
GTG
08-10-2013, 10:49 AM
53. ### Chance of an Occurance

ok, I am an accountant, not a statistician. Something happened to me personally and I would like to figure out the probability that it would have...

• Replies: 8
• Views: 2,980
07-30-2013, 11:49 PM
54. ### Bayesian prediction interval

• Replies: 8
• Views: 2,767
08-14-2013, 09:37 AM
55. ### Proving the equality of two expressions

• Replies: 8
• Views: 2,009
08-27-2013, 11:06 AM
56. ### Prob distribution

The roulette wheel has 38 “pockets”. The “pockets” are numbered 1, 2, …, 36; 0 and 00. Half of the “pockets” 1, 2, …, 36 are coloured red, the...

• Replies: 8
• Views: 1,794
09-22-2013, 07:02 AM

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