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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: 30,315
09-30-2005, 09:44 AM
1. ### Probability of getting 3 out 5

I am driving myself up the wall. I am trying to figure out the probability of getting 3 out of 5 questions right. At first my thougt was 1/5 x 1/5 x...

• Replies: 1
• Views: 7,471
09-11-2009, 10:48 AM
2. ### Process capability without variability in data?

My company uses Cpk to judge process capability, with a 1.33 Cpk being the acceptable minimum for most processes. In some cases, we do not have...

• Replies: 5
• Views: 7,385
09-11-2009, 06:41 AM
3. ### Properties of exponential distributions

We have only briefly covered exponential distributions in class, and I want to make sure I understand how the memoryless property works. If we...

• Replies: 0
• Views: 2,261
09-10-2009, 10:55 PM
4. ### Confused on total probability formula

I am very confused on how to apply the total probability formula. If X and Y are two independent continuous random variables with pdfs g(x) and...

• Replies: 2
• Views: 4,584
09-10-2009, 12:08 PM
5. ### HR or OR or RRR ?

Hi what's th différence between: "hazard ratio", "odds ratio" AND "Relative risk ratio" ??? Regards

• Replies: 0
• Views: 4,011
09-10-2009, 08:00 AM
6. ### STAT101 Simple-ish Probability

The mean monthly fee for Internet service is \$25, Standard Deviation is \$12. If a sample of 33 households is taken, what is the probability that a...

• Replies: 2
• Views: 2,368
09-09-2009, 05:01 PM
7. ### Help! Probability question.

I'm currently doing a practice assignment and I've been fine with the first 2 sections, but this 3rd part is just killing me, it's making no sense to...

• Replies: 2
• Views: 3,469
09-09-2009, 04:13 AM
8. ### Maximum likelihood estimate

Q. let X1, X2,...,Xn be obeservations from the uniform pdf fx(x;Q) = 1/Q, 0<x<Q. Find the maximum likelihood estimate of Q. (Q is theta) ...

• Replies: 1
• Views: 2,343
09-08-2009, 09:57 PM
9. ### Marginal pdf

let X and Y be random variable with joint pdf fxy(x,y) = (2/5)*(3x+2y) 0<x<1, 0<y<1. b) calculate the marginal distributions for this i did...

• Replies: 3
• Views: 6,922
09-08-2009, 12:35 PM
10. ### Samples from uniform distributions

L.S. For an internship I'm stuck with a nasty, statistical problem, so I decided to join this forum and let you guys have a go at it. Evidentily...

• Replies: 11
• Views: 3,044
09-08-2009, 12:14 PM
11. ### Probability

A stack of cards contains four Aces, three Kings, two Queens and six other cards. Seven cards are randomly drawn from the stack, without replacement...

• Replies: 0
• Views: 1,804
09-08-2009, 06:28 AM
12. ### Help! am stucked calculating marginal likelihood

Please could any one help me, i want to calculate the marginal likelihood, which depends on the prior distribution over p using any other prior...

• Replies: 0
• Views: 1,737
09-07-2009, 05:29 AM
13. ### Statistics Question (Normal Distribution)

Hello, I have taken a statistics class and I am confused with one of the problem that was put forth. The question asks for the probability...

• Replies: 0
• Views: 2,003
09-06-2009, 07:42 PM
14. ### choosing the right distribution

I am in a queueing networks class. From what I have read so far, the distributions of the arrival patterns and service patterns need to be...

• Replies: 0
• Views: 2,889
09-04-2009, 06:51 PM
15. ### Creating a joint probability table

I need help figuring out how to create this joint probability table 43 million people in the United States go without health insurance. Sample...

• Replies: 3
• Views: 19,055
09-03-2009, 09:58 PM
16. ### Stats question: random balls

There is a pool of 4500 unique balls. There are 3 people, called X, Y and Z, who are blindfolded. They take turns to take out as many balls as they...

• Replies: 3
• Views: 3,596
09-03-2009, 07:22 PM
17. ### Question on standard unit problem

Mutual Fund A has an average return of \$25,000 and Mutual Fund B has an average return of \$5,000. The standard deviation for Fund A is \$10,000 and...

• Replies: 8
• Views: 4,240
09-03-2009, 11:56 AM
18. ### Help with a simple problem - total probabilities

I don't quite understand question 2. What is it asking for, and what does it mean? A highway commission conducted a survey to learn about the...

• Replies: 3
• Views: 2,527
08-31-2009, 11:43 PM
19. ### Football game!

A team plays 3 football games. If it wins it get 3 points, if it´s even it gets 1 point and if it loses it gets nothing. What are the changes for...

• Replies: 3
• Views: 2,965
08-31-2009, 12:47 PM
20. ### Statistics and signal processing

Please, help me to understand with logic of mathematical calculations resulted in work pubs.drdc.gc.ca/PDFS/unc06/p518839.pdf. First of all to me the...

• Replies: 0
• Views: 1,897
08-30-2009, 02:18 PM
21. ### Method of moments

what are the advantages of using the method of moments instead of the maximum likelyhood for estimating the parameters? In my case I hade to find...

• Replies: 1
• Views: 2,699
08-27-2009, 08:52 AM
22. ### analyzing the PDF or the CDF ??

Hi, I'm recently grappling with the following problem: For my thesis i had to fit my data with two theoretical distribution (gamma and...

• Replies: 0
• Views: 2,360
08-27-2009, 07:22 AM
23. ### P(Mn<=x) = F^n(x)

P(Mn<=x) = F^n(x) where Mn = max(X1,...,Xn) Why is this true?

• Replies: 1
• Views: 1,906
08-26-2009, 04:26 PM
24. ### Probability that one group of successes will be greater than another

So, I'm working on this big old nerdy project, but I haven't got much of a head for statistics. I was wondering if someone would be able to help me....

• Replies: 5
• Views: 4,731
08-26-2009, 11:34 AM
25. ### Quirky wording?

Working on a problem and the wording is not very clear: The amount in a bottle is normally distributed with a mean of 11.7 ounces, and a...

• Replies: 1
• Views: 2,667
08-26-2009, 03:10 AM
26. ### game show probability question

Hello, I'm new to probability and taking an introduction to probability course. Here is a simple game show question I'm having trouble with. ...

• Replies: 2
• Views: 3,330
08-25-2009, 03:01 PM
27. ### Need Solution Verified!

Question: The income of junior executives in a large corporation are normally distributed with a standard deviation of \$2000. A cutback is pending,...

• Replies: 4
• Views: 2,791
08-25-2009, 01:38 PM
28. ### normal distribution help

Hi everyone, The question is: The time at which the pizza gets delivered follows a normal distribution with a mean of 3:00PM and a standard...

• Replies: 6
• Views: 2,113
08-25-2009, 06:42 AM
29. ### Easy question regarding percentages

I am currently working on a website project and am wishing I had paid more attention in my statistics class from a few semesters ago. Lets say...

• Replies: 3
• Views: 1,806
08-25-2009, 02:05 AM
30. ### Poisson Random Variable

If A is typing a book the number of errors is a Poisson random variable with mean 2.6 If B is typing a book the number of errors is a Poisson random...

• Replies: 1
• Views: 3,005
08-23-2009, 05:15 PM
31. ### Selections from a group with matching top pick

A person makes 6 selections from a pool of 32, 1 through 32. Six balls are drawn from a pool of 32 without replacement. The probability of...

• Replies: 0
• Views: 2,237
08-23-2009, 04:51 PM
32. ### 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: 2,657
08-23-2009, 04:23 PM
33. ### MGF of random sum

Let X1, X2,.....~N(0,1) be an iid sequence and let N ~ Poi(lambda) independently. Find the MGF of the random sum S = sum_{k=1}^N (Xk. What I...

• Replies: 0
• Views: 2,357
08-22-2009, 08:09 PM
34. ### Lottery draw question (hypothetical)

I'm new to the forum, and certainly no math wizz, but I'm hoping someone can help me with a hypothetical lottery problem. Basic setup: there are...

• Replies: 1
• Views: 3,108
08-21-2009, 05:01 AM
35. ### PDF & Cost

Hi everyone, I just need my answer verified. Suppose that the number of word processors x that are purchased each year has the following...

• Replies: 2
• Views: 3,108
08-17-2009, 10:18 AM
36. ### Another one!

I think this is correct. I would appreciate any input. Question: The potential buyer of a particular engine requires that the engine start...

• Replies: 2
• Views: 3,050
08-17-2009, 10:17 AM
37. ### PDF and CDF

The portion of people who responded to a certain mail order solicitation is a continuous random variable X that has the density function: ...

• Replies: 1
• Views: 2,904
08-14-2009, 01:15 PM
38. ### Roulette Repeat

having a discussion with a colleague who is trying convince me he has a winning strategy at roulette... lol what is an equation to determine the...

• Replies: 0
• Views: 3,298
08-13-2009, 08:48 AM

An electronic switching device occasionally malfunctions and may need to be replaced. It is known that the device is satisfactory if it makes, on...

• Replies: 10
• Views: 3,974
08-12-2009, 10:03 AM

An oil drilling company ventures into various locations, and their success or failure is independent from one location to another. Suppose that the...

• Replies: 6
• Views: 4,095
08-12-2009, 07:44 AM

So the question is: A restaurant chef prepares a tossed salad containing, on average, 5 vegetables per day. Find the probability that the salad...

• Replies: 3
• Views: 5,255
08-11-2009, 12:06 PM
42. ### Calculate Probabilty of event

Hi !!! I have a prooblem and it seems the solution is simple but I need somebody else opinion. I have k groups of numbers from 1 to n . ...

• Replies: 0
• Views: 1,579
08-11-2009, 12:04 PM
43. ### prob of at least 2/phone number problem

Here's an interesting problem I came upon A person wrote a phone number on a note and that was later lost. When he try to recollect, he can...

• Replies: 7
• Views: 4,039
08-11-2009, 08:42 AM

Hi everyone, I haven't done integration in a long time, so I just need someone to verify if my calculation is right. The question is: ...

• Replies: 2
• Views: 4,557
08-10-2009, 09:31 AM
45. ### GARCH(t, GED), VaR

Hey I stumbled over a problem for which I can’t find a solution, hopefully anybody can help me. downer I calculate the volatility from two...

• Replies: 0
• Views: 4,015
08-08-2009, 04:11 PM
46. ### Do You Know The Mathematical Formula Of This Spreadsheet?

Hi, I simply want to know the mathematical formula of this spreadsheet: That you can see by clicking there: ...

• Replies: 0
• Views: 2,987
08-08-2009, 03:20 PM
47. ### Real World Problem--Defending Your Gambling Losses

I'm a slot player, bet the maximum on dollar machines (\$40 is a typical bet). Over the period of a year I've had large wins of say, \$4000, \$14,000,...

• Replies: 0
• Views: 2,421
08-07-2009, 12:15 AM
48. ### W07p2

I think I got this one but I want to be extra sure Suppose we have three cards. The first one is blank on both sides, the second has an X on one...

• Replies: 0
• Views: 1,484
08-05-2009, 02:34 PM
49. ### Clt

This seems like it should be easy but for some reason, I'm not seeing it. Suppose we pick at random and independently 100 numbers in the interval ...

• Replies: 0
• Views: 1,711
08-04-2009, 02:45 PM
50. ### uniform pdf

Suppose X~U(0,1). Note that f(x) = 1 when 0 < x < 1 and 0 otherwise. a. What is the probability that √X is less than 1/2? for this I...

• Replies: 2
• Views: 3,020
08-04-2009, 02:29 PM

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