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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: 30,320
09-30-2005, 09:44 AM
1. ### 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: 5,108
11-03-2008, 04:16 PM
2. ### random variables

Question: The number of littly, teeny raisins (x) in a box of a popular brand of raisin bran cereal has a distribution with mean 280 and s.d. 25....

• Replies: 3
• Views: 3,840
11-04-2008, 10:41 PM
3. ### Poisson Process

Hello, Have a task I cant solve; incomming calls to a central follows a poisson process with λ > 0, infinity capasity, and all calls are taken...

• Replies: 3
• Views: 3,971
11-05-2008, 04:45 AM

I need help with part of a problem in my Stats book. There are four parts to the problem, and I understand how to do the other three parts, I'm just...

• Replies: 2
• Views: 4,412
11-05-2008, 10:41 AM
5. ### another transformation

Let X be a continuous random variable with p.d.f. f (x) = k(1 − x^2 ), |x| ≤ 1 0,otherwise Show that k = 3/4. I'm not sure...

• Replies: 2
• Views: 2,889
11-05-2008, 04:19 PM
6. ### Regression Control Chart

I have a project that needs to plot to regression control chart. Can anyone tell me which statistical software I can use for this purpose? Thanks a...

• Replies: 0
• Views: 2,691
11-05-2008, 08:51 PM
7. ### Help

I have a couple of questions on my hw that I cannot figure out please help me A) Find P(Z=0) B) Find the z-score that separates the bottom...

• Replies: 0
• Views: 1,791
11-05-2008, 09:09 PM
8. ### Can anybody help me with this probability question?

helpneeeded

• Replies: 4
• Views: 2,303
11-06-2008, 02:24 AM

have a couple of questions on my hw that I cannot figure out please help me A) Find P(Z=0) B) Find the z-score that separates the bottom...

• Replies: 2
• Views: 2,707
11-06-2008, 09:23 AM
10. ### Help! First time taking Stats and soooo confused!

I'm taking Statistics online and every week I can barely get through the assigned problems. I'm not sure how to even begin figuring out this...

• Replies: 12
• Views: 5,449
11-06-2008, 09:53 AM
11. ### Help please! The sum of two rolling die

hey! Does anyone know how to do this question: "You keep rolling a die until either: 1. The sum of the two die is equal to 7, twice 2. A 6...

• Replies: 3
• Views: 3,012
11-06-2008, 11:24 AM
12. ### zmoggggg -- Continuation of Poisson question, please verify and advise

ok so lambada value here =4 (Average of 240 planes in 1 hr) and for the following question a) atleast 1 plane arrives during the 10-minute...

• Replies: 2
• Views: 2,187
11-06-2008, 01:50 PM
13. ### uniform dist. parameter est.

Here is the problem: Use MLE to estimate the parameters of the two parameter uniform pdf f_Y_(y;theta1,theta2)=1/(theta2-theta1);...

• Replies: 1
• Views: 2,590
11-06-2008, 02:08 PM

Robert is a

• Replies: 23
• Views: 5,516
11-06-2008, 06:03 PM
15. ### Sampling marbles

I have an urn containing N marbles: M white marbles and N-M black marbles. From this urn, I need to grab a handful of marbles (n) and figure out...

• Replies: 0
• Views: 2,555
11-06-2008, 06:51 PM
16. ### Transformation of Y = 1/X

X ~ U(2,4). Find the density of Y = 1/x f(x) = (1/2, 2<x<4) (0,elsewhere) G(Y) = P(Y<y) = P(1/X<y) = P(X>1/Y) = 1 -...

• Replies: 3
• Views: 6,605
11-07-2008, 06:45 AM
17. ### Questions need help!!

Weekly demand for packs of a certain make of chocolate trifle at a major supermarket store has a Normal distribution with mean of 200 and standard...

• Replies: 0
• Views: 2,254
11-07-2008, 07:03 AM
18. ### Random Thoughts?

This is a question I am thinking through and just need some input as to whether I am reasoning correctly. I have never thought of the sample mean as...

• Replies: 3
• Views: 1,890
11-08-2008, 12:10 AM
19. ### Probability question -- T Distribution

You are the head of the Amex card group. Nationally, the credit card default rate is at 12&#37; A random sample of 25 Amex card holders shows a default...

• Replies: 3
• Views: 2,651
11-08-2008, 08:54 AM
20. ### HElp

3. (15 points / 3 points each) Wait time for a taxi outside Penn Station in New York City is uniformly distributed on the interval (0, 420) where...

• Replies: 1
• Views: 1,637
11-09-2008, 03:31 PM

I dont know why I cant get this, i know its not hard. Id really appreciate it if someone could clear this up for me =( If there are 72 multiple...

• Replies: 7
• Views: 2,415
11-11-2008, 12:16 PM
22. ### Cereal Prizes

Hi, I'm stumped on a probability question. Here's the situation...a cereal company gives away 3 different prizes in its boxes of cereal, with...

• Replies: 7
• Views: 3,819
11-11-2008, 07:39 PM
23. ### Parametric Test on Ordinal Data

Hi to everybody, can I used a parametric test to compare, for example, two independent samples when these samples contain ordinal data and are...

• Replies: 0
• Views: 3,211
11-12-2008, 11:17 AM
24. ### Complicated STATs problem

Say I have five variables A, B, C, D and E that range anywhere from -11 to 11. Given that A,B,C and D occur before E and there is correlation,...

• Replies: 0
• Views: 2,696
11-13-2008, 12:58 PM

Here is my problem. I need to estimate a ramdom variable h with a chi-square distribution, that is, h= x^2+y^2 with x and y gaussian. The observed...

• Replies: 0
• Views: 2,357
11-13-2008, 01:25 PM

I have trouble with the following two questions concerning expectations, can anyone give me a hint? Question 1) Suppose there are k=10 types of...

• Replies: 5
• Views: 3,926
11-13-2008, 03:15 PM
27. ### Somebody please verify the solution i have posted, am not 100% sure

A telecom produces telephone sets in two plants: New York, and Buffalo. Daily production volumes of a certain model are : 500 and 2000 units...

• Replies: 1
• Views: 2,095
11-13-2008, 04:39 PM
28. ### DeMorgans Law

I NEED DESPRETE HELP! I'M GONNA FAIL MY CLASS IF I DON'T GET THE ANSWERS RIGHT! PLEASEEE! Heres the problem: A local TV station predicts a 80&#37;...

• Replies: 0
• Views: 2,077
11-13-2008, 06:31 PM
29. ### Squared Normal Dist

Hello All- My problem is: Find the distribution of W=X^2 when X is N(0,4) I know that this problem is related to the fact that Z^2 =...

• Replies: 2
• Views: 3,246
11-13-2008, 07:40 PM
30. ### 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: 2,330
11-13-2008, 10:33 PM
31. ### Question: generalization for negative binomial random variable

Hello, I wonder if there is a know random variable which is a generalization of the negative binomial random variable. The generalization I search...

• Replies: 0
• Views: 2,366
twy
11-16-2008, 05:48 PM
32. ### I really need some small help here please.

Hey everybody I am new here one of my friends refered me to these forums as help. SO i have 2 small problems that i will write down right now. I...

• Replies: 1
• Views: 2,920
11-19-2008, 09:28 AM
33. ### Probability question- Are my answers correct

Question: You are given the probabilities given below: P(A)=0.30 P(B)=0.40 P(C)=0.10 P(A or D)=0.50 P(A and D)=0.04 P(A and C)=0.03...

• Replies: 0
• Views: 2,569
11-19-2008, 11:32 PM
34. ### Statistic & Probability

I am having problems completing assignment of 8 problems. I do not know what I am doing and I need this course to graduate in the spring. I would be...

• Replies: 1
• Views: 2,961
11-20-2008, 03:00 PM

Before ya slam me let me explain. I foolishly took an online statistics course. I will be failing this class... there is nothing I can do to avoid it...

• Replies: 3
• Views: 5,684
11-20-2008, 03:37 PM
36. ### Probability of exactly one?

Hello, I have a question that I am stuck on. Given: the probability of passing a Photography class is 75% and the probability of passing a...

• Replies: 9
• Views: 8,209
11-21-2008, 07:29 AM
37. ### k-sided dice

Hi everyone, Looking for a bit of help. If i throw a k-sided dice twice, what is the expected value of their sums. I'm looking for a formula for...

• Replies: 2
• Views: 2,735
11-22-2008, 08:40 PM
38. ### looking for algorithm for weighted random choice

The subject line probably doesn't quite call it what it's supposed to be called but, anyway, here's the problem: Just for the sake of argument,...

• Replies: 1
• Views: 4,821
m3p
11-23-2008, 01:02 PM
39. ### Normal distribution

Hey guys, was wondering if you guys could help me out with this, been ok so far with my Stats at Uni but not sure what to do with these examples, can...

• Replies: 2
• Views: 2,252
11-23-2008, 10:01 PM
40. ### Distribution Probabilities

Here's my question with what I have done so far.. Guess I'm looking to know if I am on the right track - thanks in advance A completely confuses...

• Replies: 2
• Views: 2,581
11-24-2008, 10:18 PM
41. ### test of significance with Poisson Distribution...

Hello guys, well my problem is the following: I have some data that I have proved that follow the Poisson distribution using chi-squared test. Then...

• Replies: 2
• Views: 6,124
nwg
11-25-2008, 03:46 PM
42. ### Random Variables

Haven't a clue where to start with this problem: Leona and Fed are friendly competitors in high school. Both are about to take the ACT college...

• Replies: 1
• Views: 6,303
11-26-2008, 12:49 AM
43. ### Calculating probability of multiple events

This is my first post so I hope I can get my question across reasonably intelligently. I have calculated the probability of an event occurring for...

• Replies: 3
• Views: 13,435
11-26-2008, 05:24 AM
44. ### random variables and variance

if we let X be a (continous or discrete) random variable with range Rx how can we find Var(X)?? i dont have any clue plz help me. thx

• Replies: 4
• Views: 3,623
11-26-2008, 07:00 AM
45. ### Probability Question

I was given 10 problems is my stats class and is having an issue with one. Can someone help me? Suppose n men throw their hats into a pile and...

• Replies: 4
• Views: 2,596
11-26-2008, 09:02 AM
46. ### uniform distribution

A bus travels between Glasgow and Edinburgh, which we suppose are 78km apart. If the bus has a breakdown, the distance from breakdown to Glasgow has...

• Replies: 5
• Views: 4,916
11-26-2008, 09:27 AM
47. ### MLE of a Gamma Distribution

Hello everyone, I'm having quite some trouble with a question about the maximum likelihood estimator of a gamma distribution. The question is as...

• Replies: 2
• Views: 28,542
11-26-2008, 01:24 PM
48. ### standard deviation of a ratio of dependent variables

Hi- I have a function (ratio essentially) r= x / (1-x) I need some way of expressing the error of r ... I've experimentally measured x and...

• Replies: 2
• Views: 11,912
11-27-2008, 04:54 AM
49. ### probability game

Hello, My friend told me about this game, a type of patience/solitaire which is seemingly impossible to complete. The idea is the following: ...

• Replies: 0
• Views: 3,220
11-27-2008, 05:04 AM
50. ### 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: 2,110
11-27-2008, 10:58 AM
51. ### how relate population to reach into tail?

Hi, I'd really appreciate if someone could help with the following question that's been bugging me for months... If I'm working with a zero-mean...

• Replies: 2
• Views: 3,379
ggk
11-27-2008, 05:49 PM
52. ### Determining expected ranges, given correlation

Hi, I have a question relating to whether or not (and if so, how) we can infer range of P10/P90 possible outcomes for a variable given a...

• Replies: 0
• Views: 2,704
11-27-2008, 06:13 PM
53. ### probability question

The baggage handling system at an airport handles 200000 pieces of luggage a year. on average only one out of every 200000 items processed by the...

• Replies: 2
• Views: 2,292
11-27-2008, 08:08 PM
54. ### Variances in Predictions?

Hi All: I am new to this forum, but glad that i have found it! I posted this in the statistics forum but it may be better suited here. ...

• Replies: 0
• Views: 2,732
11-28-2008, 12:26 PM
55. ### independent and disjoint

If C and D be independent events which are disjoint. What can we said about their probabilities?? i know C, D are independent so P(C n D)=P(C)...

• Replies: 6
• Views: 10,048
11-29-2008, 02:10 PM
56. ### Normal distribution Question

Your favourite cereals come in packs in nominal weight of 375g. The filling machine that fills the packs naturally makes mistakes with quantities. It...

• Replies: 1
• Views: 2,946
11-30-2008, 02:38 AM
57. ### MCQ related Probability

Here's the question: A MCQ has 100 questions. Each with four possible answer of which only one is correct answer. What is the probability that...

• Replies: 1
• Views: 6,164
12-01-2008, 06:34 AM
58. ### Interesting secret santa probability problem

Hi there, this is not a homework exercise, it's purely for my own (+colleagues') interest. We are doing a secret santa at work. The idea is that...

• Replies: 0
• Views: 3,968
12-02-2008, 01:09 PM
59. ### Hypergeometric distribution sample size

Dear all, I have come across a couple of formulae to calculate the sample size (n) needed to detect a given level of prevalence of a condition in...

• Replies: 0
• Views: 4,290
12-03-2008, 06:50 AM

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