1. Announcement:
05-10-2017
Views:
1,775
Page 77 of 91 First ... 27 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 Last
Threads 4561 to 4620 of 5449

# 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: 30,178
09-30-2005, 09:44 AM
1. ### 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: 3,554
05-21-2008, 04:48 PM
2. ### 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: 2,346
05-21-2008, 04:44 PM
3. ### 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: 2,525
05-20-2008, 09:21 PM
4. ### 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: 4,780
05-19-2008, 07:12 PM
5. ### 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: 2,243
05-19-2008, 05:03 AM
6. ### 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: 2,180
05-19-2008, 12:24 AM
7. ### 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: 2,462
05-18-2008, 03:12 PM
8. ### 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
9. ### 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: 12,851
05-15-2008, 01:04 AM
10. ### 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: 4,910
05-14-2008, 09:05 PM
11. ### 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: 5,440
05-14-2008, 07:03 AM

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: 2,733
05-14-2008, 03:43 AM
13. ### 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: 2,095
05-13-2008, 09:28 PM
14. ### 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: 2,486
05-10-2008, 03:18 PM
15. ### 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: 2,580
05-10-2008, 08:27 AM
16. ### 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: 4,123
05-09-2008, 06:11 PM
17. ### 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: 8,639
05-06-2008, 12:28 PM
18. ### Unconditional distribution of X, a binomial random variable

disregard..

• Replies: 0
• Views: 3,103
05-05-2008, 10:11 PM
19. ### 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: 4,946
05-05-2008, 01:12 PM
20. ### 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: 5,384
05-01-2008, 10:48 PM
21. ### 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: 2,481
04-28-2008, 03:21 PM
22. ### 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: 2,314
04-28-2008, 03:55 AM
23. ### 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: 2,220
04-27-2008, 10:26 PM
24. ### 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: 4,880
04-27-2008, 10:23 PM
25. ### 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: 2,409
04-27-2008, 05:35 AM
26. ### 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: 4,450
04-26-2008, 07:44 PM

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: 2,299
04-26-2008, 06:24 AM

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: 2,247
04-26-2008, 03:29 AM
29. ### 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: 5,802
04-25-2008, 01:26 PM
30. ### 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: 2,030
04-23-2008, 09:34 PM
31. ### 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: 5,902
04-23-2008, 07:15 PM
32. ### 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: 4,438
04-22-2008, 09:16 PM
33. ### 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: 1,891
el1
04-22-2008, 07:06 PM
34. ### 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: 7,495
04-22-2008, 05:15 PM
35. ### 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: 3,182
04-20-2008, 02:46 PM
36. ### 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: 2,264
el1
04-18-2008, 08:42 PM
37. ### 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: 3,317
el1
04-18-2008, 08:39 PM
38. ### 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: 7,950
04-18-2008, 02:27 PM
39. ### 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: 4,505
04-16-2008, 11:04 PM
40. ### 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: 2,243
04-14-2008, 07:23 PM
41. ### 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: 2,325
04-14-2008, 07:15 PM
42. ### 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: 2,700
04-14-2008, 07:03 PM
43. ### 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: 5,262
04-13-2008, 08:07 PM
44. ### 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: 1,798
04-12-2008, 11:55 PM
45. ### 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: 4,564
04-12-2008, 11:32 PM
46. ### 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: 2,456
04-12-2008, 09:27 AM
47. ### 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: 2,114
04-11-2008, 08:44 PM
48. ### 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: 2,307
04-11-2008, 09:15 AM
49. ### z standard normal

First part of the question asks..if X is normal with mean = 8.48 and sd = 1.6, what are the 2 values of X which include central 80% of probability? ...

• Replies: 1
• Views: 5,420
04-11-2008, 07:18 AM
50. ### probability help!

mean = \$1530 sd = \$120 Bookstore must sell at least \$1200 in sales to break even. What is the probabily that on a given day the bookstore will...

• Replies: 1
• Views: 2,094
04-11-2008, 07:12 AM
51. ### Normal Distribution Help :(

Hi i had a problem with a normal distribution question The question is: Find a and b such that P(a<X<b)=0.90 and such that a and b are the same...

• Replies: 1
• Views: 1,927
04-10-2008, 01:01 PM
52. ### rock paper scissors vs flipping a quarter

hello everybody. thanks for your reply ahead of time. scenario 2 people 1 time only game of rock paper scissors vs flipping a quarter what are...

• Replies: 7
• Views: 6,039
leo
04-09-2008, 08:46 AM
53. ### Two discrete random variables

Can anyone tell how to find the variance in this problem? The random variables X and Y are normally and independently distributed with means...

• Replies: 10
• Views: 4,330
04-09-2008, 08:23 AM

I was wondering if anyone new how to calculate the odds of Quads beating Quads in a texas holdem game. Assuming their were no bets to make folders. ...

• Replies: 0
• Views: 2,607
04-09-2008, 01:09 AM
55. ### The probability of an event occur >90% of the time.

An actor claims he signs 90&#37; of autographs asked for. A sample of 100 fans is taken with a normal distribution. What is the probability that the...

• Replies: 1
• Views: 2,754
04-08-2008, 08:52 PM
56. ### Moment Generating Functions

The random variable X has a uniform distribution on (0,1). Find the moment generating function of Y=-aln(X), and hence find the probability...

• Replies: 8
• Views: 3,764
04-06-2008, 12:26 PM
57. ### problem in sports statistics

My problem is this. We have three javelin throwers A,B and C. It is known that A defeats B with probability 60&#37;, B defeats C with probability again...

• Replies: 0
• Views: 2,144
04-06-2008, 05:54 AM
58. ### Round-Off errors

Problem: A set of n numbers are to be added together, and before they are added, each number is rounded off to the nearest integer, thus introducing...

• Replies: 0
• Views: 3,715
04-05-2008, 04:38 PM
59. ### Poisson process

Men, women and children make purchases at a counter in a shop according to independent Poisson processes with rates 10, 12 and 4 purchases per hour...

• Replies: 0
• Views: 2,354
04-05-2008, 02:02 PM

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.