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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: 30,184
09-30-2005, 09:44 AM
1. ### Cominatorics Question ~ How many equations can be written with n variables?

Hi everyone, currently I am doing a thesis paper. I have currently 7 variables I need to write in terms of the others to satisfy some homogeneity...

• Replies: 2
• Views: 1,715
04-20-2012, 03:21 PM
2. ### gambling probability

Hi guys, hope someone can help... I would like to find out what the probability is of recieving a 2 or a 3 card '21' score from a single deck of...

• Replies: 1
• Views: 1,967
BGM
01-16-2012, 06:57 AM
3. ### Exercise, Poisson process

This is an exercise from the book, Introduction to Probability Models by Sheldon M. Ross. Problem: A scientific theory supposes that mistakes in...

• Replies: 0
• Views: 2,904
04-06-2013, 12:05 PM
4. ### Two part PMF for a Joint Distribution problem

Suppose X and Y have the following joint distribution p(x, y) = c(x^2 + y^2). For x = -1, 0, 1, 3 and y = -1, 2, 4: A) Find the value of c that...

• Replies: 2
• Views: 5,788
12-08-2010, 10:26 AM
5. ### exponential distribution probability help

This is a modified version of one of my homework questions. Please help me out, and show your work so I know how to calculate it myself. The only...

• Replies: 3
• Views: 5,137
10-26-2009, 11:21 PM
6. ### probability of payouts

Hi and thanks for looking at this. We have a client who is donating 10% of pet ecommerce profits to shelters. We are building an online slot...

• Replies: 0
• Views: 2,220
09-15-2009, 11:13 AM
7. ### Sample size influence on the mean for non-normal distributions?

Hi, I'm not a statistician so sorry if this is dumb. I am making non-linear (neural networks) models and my errors are not supposed to be normal,...

• Replies: 1
• Views: 4,004
02-22-2011, 03:56 AM
8. ### Example of PDF with correlation of a specific value

For example example of a pdf or pmf with correlation . It is obviously easy to find ones with 0,1,-1. But what would be a good general way to...

• Replies: 2
• Views: 2,361
BGM
11-11-2013, 10:56 PM
9. ### pdf minimum of two r.v

Suppose we have a pdf f(x,y) = (1/15) for 0 < x < 3 and 0 < y < 5 we want to calculate the pdf of K = min(x,y) for 3<k< 5, => either x or y =...

• Replies: 1
• Views: 1,139
11-11-2013, 05:52 PM
10. ### Application of the unconscious statistician

A random variable Y is normal with mean u and variance s^2. Given that g(y) =exp(2y) , using a taylor series expansion around u to approximate E and...

• Replies: 1
• Views: 1,750
02-08-2014, 10:18 PM
11. ### finding e10 need help lost

Given the sample space S={e1, e2, e3, …, e10}, where P(e1)=P(e3)=P(e5)=P(e7)=P(e8)=P(e9)=0.1 and P(e2)=0.05, P(e4)=0.12, p(e6)=0.14. Consider the...

• Replies: 0
• Views: 2,299
02-11-2008, 01:16 AM
12. ### Probabilty question

I am trying to figure this problem out. I know it seems simple, but for some reason I am having a hard time with this. Can someone show me how to...

• Replies: 1
• Views: 3,025
09-18-2006, 08:40 PM
13. ### Probability Density Function

Hello guys I just want my work to be reviewed on this exercise please :) Consider X a random variable with pdf f X (x) = (3/8) * (1-x)^2 if...

• Replies: 4
• Views: 2,650
BGM
12-05-2011, 11:04 AM
14. ### Probability Distribution Function

Hello guys hope you are good, I have a final question. Suppose that the r.v X represents the radius of a ball and that X has probability...

• Replies: 6
• Views: 2,276
12-05-2011, 12:28 PM
15. ### Moment Generating Function

If the joint moment generating function of X and Y is M X,Y (t1, t2) = 6 / (1-t1) * and X,Y are the times that required for two tasks to be...

• Replies: 16
• Views: 5,678
02-23-2012, 01:13 PM
16. ### I'm very confused...(Normal Distribution)

Hi people...I really should of come here sooner to try and ask for help, but I just kept letting myself sink deeper and deeper... Now I have some...

• Replies: 4
• Views: 3,149
11-21-2006, 11:14 PM
17. ### How to do cumulative confidences from child objects to a parent object?

Hi I need some help with cumulative confidences. For example. I have 5 shops, each forecasting to sell x number of TABLET PCs by the end of the...

• Replies: 4
• Views: 1,239
03-01-2013, 12:17 AM
18. ### Mann-Whitney U Test

Hello everyone, Thank you all for providing and maintaining this forum. I'm currently working with two data sets collected ten months apart,...

• Replies: 3
• Views: 1,102
02-02-2016, 04:27 PM
19. ### Interesting ways to generate a random normal deviate

I was thinking of ways to generate a random normal observation from a single random uniform(0,1) observation. I have at least 3 interesting ways in...

• Replies: 1
• Views: 2,128
09-15-2012, 02:41 AM
20. ### Is this right?

I'm doing a research paper in international relations and I need some help describing the data. For example, in 13 interventions in civil wars, I...

• Replies: 1
• Views: 1,221
06-30-2016, 02:31 PM
21. ### 13 card straight - Calculation correct?

Hello! I am trying to compute the Pr. of being dealt a 13 card straight out of a standard 52 card deck. (ie. 23456789TJQKA) Here's my...

• Replies: 1
• Views: 5,288
03-14-2009, 01:38 PM
22. ### Probabilities associated with simple events

An experiment can result in one of five equally likely simple events, E1, E2..... E5. Events A, B and C are defined as follows. A: E1, E3 ...

• Replies: 0
• Views: 1,622
10-05-2013, 08:50 AM
23. ### correct update of bayesian posteriors

the question looks a bit artificial but I simply tried to get rid of useless details. There are two persons, A, and B. they each got a number, a...

• Replies: 1
• Views: 1,260
BGM
11-12-2015, 11:58 PM
24. ### question regarding distribution mean (app Crystal Ball)

Hi everyone, I have a question that I have come across running some Crystal Ball simulations however, I think the problem is rather a generic...

• Replies: 1
• Views: 2,411
BGM
11-11-2011, 05:27 AM
25. ### Definition of (objective) Probability

There are two definition as far as I know (not including subjective probability), and each one has its problems: 1. If O is the set of all equally...

• Replies: 1
• Views: 2,588
01-21-2012, 09:54 AM
26. ### Request for help developing a commercial solution

Firstly, I apologise if I am in the wrong place. In a business context we need to produce a model to help planning tasks. We are a small commercial...

• Replies: 0
• Views: 1,327
02-28-2012, 12:02 PM
27. ### Arithmetic proof of predicted values

Maybe the title of this thread should be: Arithmetic proof of predicted values or Why you shouldn't let stats lie dormant in your life for 7...

• Replies: 2
• Views: 2,376
02-25-2011, 01:08 PM
28. ### Deriving posterior probability from frequencies

I'm working through an introductory Bayesian stats text: Doing Bayesian Analysis. Having been away from stats for a while and having never working...

• Replies: 5
• Views: 3,561
11-29-2012, 01:15 PM
29. ### approximating density function for a non-normal distribution

Hello, My question is actually quite short, but I'll have to start by describing the context since I am not sure how to directly ask it. ...

• Replies: 1
• Views: 3,971
08-01-2010, 11:18 PM
30. ### Explanation counting principle problem

If a travel agency o ers special weekend trips to 12 di erent cities, by air, rail, bus, or sea, in how many di erent ways can such a trip be...

• Replies: 4
• Views: 3,589
BGM
06-18-2014, 12:50 AM
31. ### Game probability query

I'm trying to develop a game idea - a kind of passport bingo. 200 people each have passports. Each passport has a 9 digit number. If I read out a...

• Replies: 0
• Views: 1,203
02-27-2015, 07:05 AM
32. ### basic probability question

Probability of 12 defects in one batch = 0.3060 If two more batches are produced, find the probability that all 3 batches will contain at least 12...

• Replies: 2
• Views: 2,636
04-03-2006, 03:00 PM
33. ### Help on probability

Probability of 12 defects in one batch = 0.3060 If two more batches are produced, find the probability that all 3 batches will contain at least 12...

• Replies: 4
• Views: 2,681
04-05-2006, 10:01 AM
34. ### Please help me with this problem

The random variable x represents the number of boys in a family of three children. Assuming that boys and girls are equally likely, find the mean and...

• Replies: 13
• Views: 6,275
10-27-2010, 09:12 PM
35. ### Please assist with issue

Decide whether the experiment is a binomial experiment. If it is not, explain why. Each week, a man plays a game in which he has a 41% chance of...

• Replies: 2
• Views: 3,012
BGM
10-31-2010, 03:45 PM
36. ### please help

1. The following data represent the pulse rates of females: Pulse Rate Frequency 60 - 69 12 70 - 79 14 80 - 89 11 90- 99 1 ...

• Replies: 3
• Views: 3,241
12-07-2010, 09:06 PM
37. ### problem with a Combination rule word problem

I am having a little trouble finding the answer to this word problem If you drew three cards form a standard deck without replacement, what would...

• Replies: 1
• Views: 6,649
11-02-2009, 02:13 PM
38. ### Probability distribution

hi everyone, I am unable to solve this exercice can you help me please ? Exercice : Starbucks has entered into an agreement with a...

• Replies: 4
• Views: 1,823
05-15-2013, 01:30 PM
39. ### Poisson Distribution

Hai everyone, I am stuck with this exercise Arrivals to a bank automated teller machine (ATM) are distributed according to a poisson...

• Replies: 4
• Views: 2,923
05-16-2013, 02:29 PM
40. ### Probability

According to a survey done by a dealership company, they have 40% of customer who enters the shop that are woman and it says that there are 37% of...

• Replies: 3
• Views: 1,739
06-11-2013, 08:03 AM
41. ### Easy Probability Question

Hi ppl, Im trying to solve to following simple problem but I'm finding it harder than expected. This problem has to be eventually be generalized...

• Replies: 6
• Views: 2,864
08-09-2010, 08:46 PM
42. ### Am I right?

:confused: Here is the Question. The probablity that one of your new batch of printers will break down has been an unacceptable 0.2 each day. You...

• Replies: 1
• Views: 2,360
11-15-2007, 10:09 PM
43. ### Probability of the sample Mean

The weight (x) of an adult salmon in Lake Michigan is a normally distributed variable with the mean 5.5 lbs and a standard deviation of 0.5 lbs. An...

• Replies: 0
• Views: 2,422
12-07-2010, 06:11 PM
44. ### Conditional probability problem

Hi, So here's the problem I've been working on for several hours now: "Deer ticks can be carriers of either Lyme disease or HGE. Based on a...

• Replies: 7
• Views: 5,954
02-06-2012, 09:27 PM
45. ### How do I figure out the E[X]?

Consider a game called “Money Bags”. The game consists of drawing from a bag filled with (25) twenty five chips with different values: • (1) One...

• Replies: 1
• Views: 2,565
12-07-2012, 03:40 AM
46. ### Probability question!!

How do we use z-scores to compute the probability of normally distributed, continuous variables? Does it have to do with the pearson r...

• Replies: 0
• Views: 2,589
11-07-2007, 06:11 PM
47. ### Hypergeometric Random Variable help!

Here's the question, I've tried all the formulas given to me in the chapter, and none are working. I'm guessing to use the mean and...

• Replies: 4
• Views: 5,826
10-24-2011, 03:01 PM
48. ### Combined probabilities

Hi all! I have a pretty interesting problem that I was hoping someone here could help me with. I am designing an application where a given user...

• Replies: 0
• Views: 2,764
07-24-2009, 11:59 PM
49. ### Probability of Drivinf while intoxicated

On New Year's Eve, the probability of a person having a car accident is 0.09. The probability of a person driving wh)le intoxicated is 0.32 and...

• Replies: 2
• Views: 3,676
02-05-2013, 08:32 AM
50. ### Probability of multiple tags on a sea turtles pinging within an hour

There are 7 sea turtles each with a pinging tag on it. Turtle 1: 52% of an hour tag is pinging Turtle 2: 52% of an hour tag is pinging Turtle 3:...

• Replies: 2
• Views: 1,704
09-18-2012, 02:39 PM
51. ### Probability Problems! Help! Thanks

Recently bar codes put on retail products were changed so that they would represent 14 digits instead of 12. How many different products can now be...

• Replies: 1
• Views: 3,474
07-01-2008, 07:44 AM
52. ### Calculation of Frequency

Hi, I am trying to calculate the probability of randomly picking a card (A through 2) from a standard deck of 52 + 1 joker if 5 cards are dealt. ...

• Replies: 0
• Views: 1,748
07-16-2009, 04:04 PM
53. ### Can ANYONE solve this??????

I am trying to figure out the method I should use to find the probability of picking any rank of cards (Ace through Deuce) from a standard deck of 52...

• Replies: 5
• Views: 3,027
07-20-2009, 01:15 PM
54. ### New Approach

:confused::confused: I am still unable to find the probability of drawing only ONE queen if 5 cards are dealt from a standard deck of 52. I think I...

• Replies: 2
• Views: 2,083
07-19-2009, 01:24 PM
55. ### Probability of getting a certain card game hand combo

Trying to figure out the chance of getting a certain combination of cards in a card game. This is related to Magic: The Gathering if that matters. ...

• Replies: 0
• Views: 882
04-13-2016, 11:31 PM
56. ### Comparing conditional probabilities?

I have 250 respondents. They’ve reported their participation in three different kinds of political activities: reading about politics on line,...

• Replies: 2
• Views: 2,858
07-17-2008, 08:22 PM
57. ### Manufacturing machine probability problem

There are three possible environment conditions: normal, rainy and hot. Rainy and hot days may be risky to a system that has been deployed, but...

• Replies: 5
• Views: 3,239
03-06-2016, 02:29 AM

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