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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: 30,285
09-30-2005, 09:44 AM
1. ### Time Series Analysis

Hello All. I am a new member to this forum. I wish to understand a couple of papers ...

• Replies: 7
• Views: 7,182
04-18-2017, 03:10 PM
2. ### Same flat tire

Hello, I am unsure about how to solve this one: It's Friday afternoon and six fraternity brothers at UNC have just attended their last class of the...

• Replies: 7
• Views: 4,592
02-26-2014, 12:24 AM
3. ### How to find P(x1<x2)

X2 and x1 being 2 independent exponential variables with mean 5 and 2. I found f(x1) and f(x2) and defined y as x2 - x1 but I'm stuck there. How do...

• Replies: 7
• Views: 3,567
11-17-2013, 06:48 PM
4. ### comparison with normal distribution truncated

Hello, I would to know how to calculate the probability that X > Y when Y is greater than a given value p (X and Y are random variable following...

• Replies: 7
• Views: 1,843
06-04-2014, 06:53 AM
5. ### Building confidence intervals using Coefficient of variation

Hi I have a doubt and i need to understand it. At my work, my colleagues use the coefficient of variation for doing confidence intervals. Not...

• Replies: 7
• Views: 1,962
08-05-2014, 12:51 PM
6. ### Process Control

Hi, Could anyone help me with a statistical process control problem i have? I am measuring a process which gives a measured value range from 0...

• Replies: 7
• Views: 2,496
10-01-2014, 09:34 AM
7. ### Problem:Finding n-stickers

Hello, we ( students ) were given a very randomly homework. I say randomly because we've been solving PROBABILITY tasks and now suddenly we were...

• Replies: 7
• Views: 2,024
BGM
11-10-2014, 01:08 PM
8. ### Conditional Variance

Hi, I have difficulty understanding the definition of conditional variance as: var(X|Y) = E)**2 | Y]. Given the definition of variance of a...

• Replies: 7
• Views: 1,882
12-01-2014, 10:12 AM
9. ### Poll: A probability problem

Hi all, I would like to solve the problem bellow. To some it might seem to eassy. However i would appreciate some hints. Thanks in advance ... ...

• Replies: 7
• Views: 2,731
04-26-2015, 04:51 PM
10. ### Bayesian Convergence

I have to go to bed any minute, so I apologize for the lack of detail provided. I was thinking about repeated testing and how probabilities...

• Replies: 7
• Views: 1,778
05-13-2015, 03:26 AM
11. ### How to calculate how often a specific combination occurs in random design?

Hi everybody, I hope someone can help me out! We designed an experiment in which 24 short clips are shown to particpants. These clips belong to...

• Replies: 7
• Views: 2,629
09-11-2015, 10:56 AM
12. ### Probability function based on X ~ Exp(B)

I have a problem which im having difficulties to solve. We have a continuous variable X = time measured in hours until event A happens. X is...

• Replies: 7
• Views: 1,689
09-25-2015, 05:52 AM
13. ### Calculating the Probability of a Subset

I'm a newbie and not a stats savvy so help and guidance is appreciated. If I use incorrect terms please forgive and correct. The data set...

• Replies: 7
• Views: 1,860
09-27-2015, 01:38 AM
14. ### Probability Of insurance sales

Just a disclaimer I know I am omitting important factors such as competition, earned premium etc etc. I'm just using this exercise so I can start...

• Replies: 7
• Views: 1,770
04-26-2016, 02:50 PM
15. ### a low correlation and a strong significance = can the null hypothesis be rejected?

I have found that there is a very low negative correlation (r= - 0.17) with strong significance (p<0.0001) between A test and B test. The null...

• Replies: 7
• Views: 1,434
04-22-2016, 09:07 AM
16. ### Easy Coin Flip Problem ???

Hi, I need help. Assume the probability of flipping a coin to heads 20 times in a row is 1:1,000,000 Q: Each day you wake up and flip a coin...

• Replies: 7
• Views: 1,938
05-18-2016, 01:54 PM
17. ### Definition of random variable with respect to event space

It is given that: We toss two dice with sample space Ω = {(i, j), 1 ≤ i, j ≤ 6} and the σ-algebra is generated by the events Ak = {(i,j) :...

• Replies: 7
• Views: 3,488
10-18-2016, 07:26 AM
18. ### Solving a LogNormal Conditional expectation equation - Insurance

Hi everyone, I am a newbie here and apologize if this post is in the wrong forum. I need help to solve the following LogNormal Conditional...

• Replies: 7
• Views: 3,265
12-16-2016, 11:02 AM
19. ### Roulette - expected value

Hello, I want to calculate the expected pay-out of european roulette spins. Particularly, I want to know what is the expected pay-out at the...

• Replies: 7
• Views: 2,565
03-02-2017, 04:06 AM
20. ### help!?!

Suppose you are the admissions officer at a university. Your university has room for a first year class of 5,000. When you admit students, you know...

• Replies: 6
• Views: 3,032
11-04-2005, 12:05 AM

Need guidance. 2 machines, each produce half of the total garments Probability that an irregular garment will come from machine 1 is 0.05...

• Replies: 6
• Views: 3,635
02-04-2006, 10:05 PM
22. ### Probability help

In a meat packaging plant, Machine A accounts for 60% of the plant’s output while Machine B accounts for 40% of the plant’s output. 1% of the...

• Replies: 6
• Views: 3,244
04-05-2006, 09:55 AM
23. ### help me

can any bady help me to solve this problem :confused: Problem 1: An airline finds that 4 percent of the passengers that make reservations on a...

• Replies: 6
• Views: 2,723
12-04-2006, 04:11 PM
24. ### Stuck on a problem that should be easy

So this is one of the first problems in our chapter on probability. I'm assuming I am supposed to intuit how to do this, because there are no other...

• Replies: 6
• Views: 5,073
09-19-2006, 02:57 PM
25. ### 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: 5,447
05-01-2008, 10:48 PM
26. ### 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: 2,597
05-10-2008, 08:27 AM
27. ### 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: 2,997
05-30-2008, 11:30 AM
28. ### Probability Question

I need help solving this question: P(X^2 > Y) = 0.025 where X^2~X^2(21)

• Replies: 6
• Views: 4,162
06-04-2008, 01:26 PM
29. ### Uniform distribution

First of all i'm sorry for my english:shakehead ! I'm an Italian logistic engineering student, I've some trouble trying to solve this kind of...

• Replies: 6
• Views: 6,236
06-23-2008, 08:24 AM
30. ### Probability - Multiplication/addition rules?

I have been working on this problem and have come up with answers, but I have a feeling they are wrong...Hoping people much more intelligent in...

• Replies: 6
• Views: 4,727
07-01-2008, 11:16 PM
31. ### Need help in finding the probability of events occuring?

Question: i have a total of 16 events whereby the probability of 2 events occuring is 0.3, the probability of 6 events occuring is 0.003 and the...

• Replies: 6
• Views: 5,520
07-20-2008, 01:38 AM
32. ### Poisson/Binomial distribution help

Hi everyone I'm enrolled in a first year intro stats paper at uni and am having difficulty solving questions on proportions using binomial or...

• Replies: 6
• Views: 3,633
08-06-2008, 04:59 PM
33. ### probability concepts

Hi, In Devore and Farnum (Applied Statistics and Scientists and Engineers), it gives this question on p. 210: "Suppose that there is a...

• Replies: 6
• Views: 3,523
08-13-2008, 07:16 PM
34. ### Dice roll

Sorry if this topic has been discussed before. I hate looking through forums randomly for an answer to a question. So, maybe one of you could help...

• Replies: 6
• Views: 2,618
08-29-2008, 10:21 PM
35. ### Some Questions

i) find a formula for the number of sequences of 0's and 1's of lenght n such that the sum of the 0's and 1's in the sequence is k ii) prove that...

• Replies: 6
• Views: 2,476
09-15-2008, 09:23 AM
36. ### Independent Events Occurring Simultaniously

This should be an easy one for you smart guys: Consider a double computer intruder detection system (IDS) with system A and system B. If there is...

• Replies: 6
• Views: 9,009
10-10-2008, 07:48 AM
37. ### Very easy question for you...help

Assume that the rate of return on projects is a random variable having a normal distribution with standard deviation = 0.05 per cent. If a bank...

• Replies: 6
• Views: 2,856
10-20-2008, 11:10 AM
38. ### transformation of distributions

Here is a question: Consider a uniform variable U on (0,1) and define the variable X=e^u. Find the distribution of X. Here is the work I've...

• Replies: 6
• Views: 2,260
10-26-2008, 01:41 PM
39. ### 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: 10,039
11-29-2008, 02:10 PM
40. ### Joint distribution, find P(X^2 + Y^2 <=1)

I am trying to teach myself (without a tutor) some degree level Statistics. I think I've answered parts a-c of this question, but would like...

• Replies: 6
• Views: 22,584
01-17-2009, 02:42 PM

I am trying to finish my thesis for my Masters in Civil Engineering and have run into a statistics/ probability question which my one Engineering...

• Replies: 6
• Views: 2,765
02-05-2009, 06:45 PM
42. ### Confirmation: Urgent!

Hey all, I just wrote my final exam and there were a set of questions I'm not sure I answered correctly: A deck of 52 cards is shuffled, then we...

• Replies: 6
• Views: 3,017
02-28-2009, 11:02 PM
43. ### Student Enrollment Probability

Hey everyone, back again with another problem giving me problems. A local university reports that 3% of their students take their general...

• Replies: 6
• Views: 8,289
02-27-2009, 07:44 PM
44. ### Joint Probability Distribution

Hello all! Having a bit of problems here with making the table for a joint distribution: Question: 3 Fair coins are tossed. Let X = #of heads in...

• Replies: 6
• Views: 10,307
02-27-2009, 07:51 PM
45. ### picking 50 yellow marbles

If there's a jar with 663 yellow marbles out of 849 total marbles, what is probability that i will extract 50 yellow marbles in 50 tries?

• Replies: 6
• Views: 3,320
03-10-2009, 11:02 AM
46. ### mutually exclusive events

Hi guys, please help. I have to check whether the following events are mutually exclusive: (a) P(X) = 0.2, P(Y) = 0.3, P(Z) =...

• Replies: 6
• Views: 2,884
03-21-2009, 04:46 PM

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: 4,093
08-12-2009, 07:44 AM
48. ### 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: 2,111
08-25-2009, 06:42 AM
49. ### binomial probability question

The probability of having a boy = .51 and the probability of having a girl = .49. Find the largest number, "x," that will make this statement...

• Replies: 6
• Views: 3,582
10-14-2009, 10:18 PM
50. ### Restaurant Grand Opening probability question

Hi, i was wondering if anyone could help me figure out something. Here is the situation: There is a chain restaurant that has grand openings in new...

• Replies: 6
• Views: 3,203
01-15-2010, 01:42 PM
51. ### Normal R.V. (z) multiplied by a function of z

it is found in one of the papers I've read recently and written: z ~ N(m,v) and f(z) is just any function of z then E(exp(z)*f(z)) =...

• Replies: 6
• Views: 3,340
02-01-2010, 06:09 AM

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