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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: 30,366
09-30-2005, 09:44 AM
1. ### Probability distribution (NEED HELP BIG TIME)

========================================================= *PLEASE DON'T simply write the answer, I NEED STEP BY STEP, on how to do it...

• Replies: 5
• Views: 2,331
04-11-2008, 09:15 AM
2. ### Liberal Arts Major looking for help - instant win game probability

Problem to solve regarding an instant win game. 35 million game pieces are circulated via the mail. Randomly, 1,000 winning game pieces of \$5,000...

• Replies: 0
• Views: 2,140
04-11-2008, 08:44 PM
3. ### poisson question

I have great trouble translating word problems into a formula- I am particularly dyslexic with numbers. I have a problem that I have worked on for...

• Replies: 0
• Views: 2,497
04-12-2008, 09:27 AM
4. ### 3D Random Walk

Okay, so I've got this random walk problem here: (a) Using an appropriate Dirac-delta function, find the probability density w(s) for...

• Replies: 1
• Views: 4,631
04-12-2008, 11:32 PM
5. ### Probability Help!

Its is known that different diseases can produce the same symtoms. We know that a particular sets of symptoms, which we will call H, can occur with...

• Replies: 1
• Views: 1,819
04-12-2008, 11:55 PM
6. ### Discrete Distributions: Coin Toss

Let X be the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. a. Find the probability mass function...

• Replies: 3
• Views: 5,338
04-13-2008, 08:07 PM
7. ### Comparing 2 choice simulations

Hello there, I am stumped with a conceptual problem, for which I am sure there is a very simple solution. There are 2 computer models of...

• Replies: 1
• Views: 2,733
04-14-2008, 07:03 PM
8. ### Binomial Distribution

I just want someone to please verify whether my approach to this problem is correct. The question goes as follows; Use a binomial distribution to...

• Replies: 1
• Views: 2,343
04-14-2008, 07:15 PM
9. ### Help Needed With A Normal Ditribution Problem.

The test scores for 300 students were entered into computer, analysed and stored in a file. Someone accidentally erased a major portion of this file...

• Replies: 1
• Views: 2,275
04-14-2008, 07:23 PM
10. ### Probability of Word within Word

Hello! I'm in dire need of help as I've been working on this for a couple days now. I've been to the help center around school and have had three...

• Replies: 2
• Views: 4,561
04-16-2008, 11:04 PM
11. ### Elevator probability question

This morning, when I walked into the elevator, I had this question in my mind. Five people walk into an elevator at Ground level. There are 17...

• Replies: 4
• Views: 8,027
04-18-2008, 02:27 PM
12. ### Confidence intervals?

Hi my questions is this. Using PHstat or by hand set up a 90% confidence interval estimate of the number of days absent. Sample of 25 people....

• Replies: 2
• Views: 3,356
el1
04-18-2008, 08:39 PM
13. ### Normal Probability HELP!!!

i have a question that asks what the probability that sales drop below 15000 per month , and also 18000 per month, mean is 20000 and stddev is 3000....

• Replies: 0
• Views: 2,319
el1
04-18-2008, 08:42 PM
14. ### frequency distribution of word length

I want to be clear about the frequency distribution that what is this and what is mean by frequency distribution of word length? Can you please...

• Replies: 0
• Views: 3,214
04-20-2008, 02:46 PM
15. ### Joint density function

This is from Exercise 5.26 from Mathematical Statistics with Applications v6. f (y1, y2) = {2, 0 <= y1 <= 1, 0 <= y2 <= 1, 0 <= y1 + y2 <= 1 ...

• Replies: 17
• Views: 7,576
04-22-2008, 05:15 PM
16. ### Z test

Hi , i have a question regarding z test and testing at 5% level. If sample size is 60 S=11.7 X=42.8 and i use formula Z= X-mu ...

• Replies: 3
• Views: 1,935
el1
04-22-2008, 07:06 PM
17. ### Prob of happening by chance

Say I have 1000 balls. 50% are blue, 50% are red. Someone trys to convince me they can pick red balls from the bag without looking at the balls. ...

• Replies: 9
• Views: 4,482
04-22-2008, 09:16 PM
18. ### Percentage overlap of two gaussian distributions

I would like to know how to calculate the overlap between two one dimensional gaussian distributions. Here is my approach: 1) Find the point, x*,...

• Replies: 0
• Views: 5,964
04-23-2008, 07:15 PM
19. ### Need help asap with probability qusetion please

Mechanico *** produce many different specialist components for industry. One such component that is made are pipe sections used in commercial...

• Replies: 0
• Views: 2,060
04-23-2008, 09:34 PM
20. ### birth defects - probability

I am new and really stuck with this one: Analyzing cases of a rare congenital defect>>>>>>>>>>>>> • 1 female in 30 in the population carries the...

• Replies: 3
• Views: 5,845
04-25-2008, 01:26 PM

Help please I am completely lost on this problem could someone help me by explaining what formula to use? Once I have a formula I should be able to...

• Replies: 0
• Views: 2,298
04-26-2008, 03:29 AM

Please look over this problem I have solved it but the answers I have gotten seem unlikely. If they are correct please let me know otherwise please...

• Replies: 0
• Views: 2,323
04-26-2008, 06:24 AM
23. ### Need Extreme Help!!!

Here is the problem I am having trouble with. A tire company finds the lifespan for one brand of its tires is normally distributed with a mean of...

• Replies: 2
• Views: 4,534
04-26-2008, 07:44 PM
24. ### Probability help

An investment offers the chances of various returns for each of 3 years as follows- Year Return- \$30,000 \$40,000 1 ...

• Replies: 0
• Views: 2,435
04-27-2008, 05:35 AM
25. ### 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: 4,986
04-27-2008, 10:23 PM
26. ### URGENT Probability Q

20% of private dwellings are fully owned by their residents (not under mortgage). In a group of 500 properties find the probability that at least 115...

• Replies: 1
• Views: 2,244
04-27-2008, 10:26 PM
27. ### Quality estimation of one and an entire set of elements

Suppose that I have a set of 10000 elements to buy/sell; I want to do some quality assurance activity in order to avoid to buy/sell invalid elements....

• Replies: 0
• Views: 2,359
04-28-2008, 03:55 AM
28. ### The probability of a rise or fall in blood pressure??

I have developed a database program that searches for all blood pressure readings that are similar to the readings of any given patient. The program...

• Replies: 1
• Views: 2,525
04-28-2008, 03:21 PM
29. ### Homework Help

I am not sure where to begin or what to do with the below question. Any help would be ace. Cheers. Suppose that fifty people are to be given a...

• Replies: 6
• Views: 5,480
05-01-2008, 10:48 PM
30. ### Four-Sided Die Question

Consider the trial on which a 4 is first observed in successive rolls of a four-sided die. Let A be the event that 4 is observed on the first trial....

• Replies: 4
• Views: 5,023
05-05-2008, 01:12 PM
31. ### Unconditional distribution of X, a binomial random variable

disregard..

• Replies: 0
• Views: 3,122
05-05-2008, 10:11 PM
32. ### chess probability question

Hello, This question is taken from Ross' a first course in probability chapter 2. It is question 17. Here it is: If 8 rooks are randomly...

• Replies: 4
• Views: 8,715
05-06-2008, 12:28 PM
33. ### Exam Question. Conditional Prob and Dist Functions

Hi Everyone. I was hoping somebody could help me with this question. I think i have confused myself to a point where I am just lost on it. X...

• Replies: 3
• Views: 4,189
05-09-2008, 06:11 PM
34. ### probability proof help

Hi, I need to prove the following argument , can anyone help? Let A={a1,a2,...am} and B={b1,b2,...bn} are 2 group of random variables. ...

• Replies: 6
• Views: 2,608
05-10-2008, 08:27 AM
35. ### Probability

Let A and B be constants such that A < B. Let z be a standard normal random variable. For what values of A does P(A<z<B)approximately equal P(z<B)?...

• Replies: 5
• Views: 2,527
05-10-2008, 03:18 PM
36. ### conditional probability problem

can anyone give hint? if i apply the usual conditional probability rule what i get, for the 1st one say, is f(sigma_theta^2, sigma^2, mu, theta,...

• Replies: 0
• Views: 2,150
05-13-2008, 09:28 PM

hi, maybe someone can help with the following problem: i counted quadrat of a grid with or without incidents. the grid covered a periphery area...

• Replies: 4
• Views: 2,777
05-14-2008, 03:43 AM
38. ### PDF and E(Y)

Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

• Replies: 8
• Views: 5,478
05-14-2008, 07:03 AM
39. ### scrabble probability =]

if im the first to draw all 7 SCRABBLE tiles what is the probabiltiy ill get an X and J? another question: what is the probabilty ill get...

• Replies: 1
• Views: 4,962
05-14-2008, 09:05 PM
40. ### Determining Joint PDFs, and Marginal PDFs

Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

• Replies: 13
• Views: 12,908
05-15-2008, 01:04 AM
41. ### 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: 2,981
05-15-2008, 06:57 PM
42. ### Probability

Need help with this probability The probability that a student has a Visa card (event V) is .70. The probability that a student has a MasterCard...

• Replies: 1
• Views: 2,501
05-18-2008, 03:12 PM
43. ### Poisson Mean

Hello Everyone, Im not sure if i posted at the right section if not im extending my apologies in advance. Ive been reading this network...

• Replies: 0
• Views: 2,216
05-19-2008, 12:24 AM
44. ### probability problem

A bag contains X quarters and Y dimes. Since quarters are bigger, any given quarter is twice as likely to be picked as any given dime. You pick Z...

• Replies: 1
• Views: 2,269
05-19-2008, 05:03 AM
45. ### Probability that a number in a group of numbers to be less than the average of group

Hi, I am new to probability and would like to know how to find the probability that a number in a group of numbers is less than the average of that...

• Replies: 2
• Views: 4,826
05-19-2008, 07:12 PM
46. ### probability

Here is the question: After researching tumours of a particular type, a doctor at Princess Margaret Hospital learns that out of 10,000 such tumours...

• Replies: 2
• Views: 2,566
05-20-2008, 09:21 PM
47. ### Joint probabillity density function

Hi I have posted this question on another site as i am new to this one and did not know how to include a formula (plus this question is unlike my...

• Replies: 2
• Views: 2,378
05-21-2008, 04:44 PM
48. ### discrete random variable and determine its characteristic function

Let Xn be a discrete random variable that takes the values 1,2, . ...... n with equal probability. Evaluate the probability generating function of Xn...

• Replies: 0
• Views: 3,642
05-21-2008, 04:48 PM
49. ### correlation coefficient

Let X1 and X2 be independent random variables with EXi =Ui (where U is actually Mu) and Var(Xi) =Sigma^2 where sigma(i)^2 >0 and i=1,2,3..... Let Y1...

• Replies: 1
• Views: 3,366
05-21-2008, 05:31 PM
50. ### E(X) and Var(X) of pgf

Hi everybody, I have the following question that I have to answer. The pgf of a non-negative, integer-valued random variable X is given by ...

• Replies: 1
• Views: 3,162
05-22-2008, 05:22 AM
51. ### Probability Confusion

A sequence of N independent Bernoulli trials is performed, where N in a non-negative integer-valued random variable, and the probability of success...

• Replies: 1
• Views: 2,507
05-22-2008, 12:33 PM
52. ### Need help getting started on some problems

I have a worksheet here over my entire semester in stats and some of the problems are from very early in the semester and I can't find a way to even...

• Replies: 5
• Views: 3,897
05-22-2008, 01:23 PM
53. ### What is a moment generating function intuitively?

I don't understand intuitively what's a moment generating function. Can someone explain intuitively what's a moment generating function? Thanks.

• Replies: 0
• Views: 2,926
05-22-2008, 02:20 PM
54. ### Probability and Moment Generating Functions

Hello, I am terrible when it comes to probability and moment generating functions. I missed 2 lectures this week and I am now completely lost on...

• Replies: 5
• Views: 3,620
05-22-2008, 02:43 PM
55. ### Normal Distribution

How to find a Mean of a specified area (eg Area right side of the mean of distribution) in the normal distribution? Is there any way to do that?

• Replies: 1
• Views: 2,334
05-24-2008, 11:46 AM
56. ### z-test for a proportion

Please help... Lets say that I have developed a new method and software prototype that aims to significantly reduce the ambiguity inherent in...

• Replies: 1
• Views: 4,143
05-29-2008, 07:40 AM
57. ### Video game equipment

Hello everyone, My friend has been playing this game called Tabula Rasa, and is trying to make the perfect armor for his character. In order to do...

• Replies: 5
• Views: 4,655
05-30-2008, 12:00 AM
58. ### Probability Question

I'm having trouble figuring this out. 3 digits are chosen in order from 0, 1, 2 ... 9. What is the probability that first < second < third a)...

• Replies: 6
• Views: 3,006
05-30-2008, 11:30 AM

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