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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: 30,343
09-30-2005, 09:44 AM
1. ### Standard Deviation from Percentiles and Mean

Hello to all and thank you in advance for the help with this. I am working with a lognormal distribution and am given Percentiles - P10, P50, P90,...

• Replies: 7
• Views: 36,400
12-23-2010, 02:14 PM
2. ### Probability Concepts Homework Help!!

Hi, I have been struggling with this question for the past few days now and still can't seem to figure it out. If anyone can help me and show me...

• Replies: 7
• Views: 12,528
02-24-2010, 12:51 PM
3. ### Reinforced Probability

Hello All, I have been trying for ages to solve this, so any advice no matter how minimal would be greatly appreciated. Suppose there is some...

• Replies: 7
• Views: 2,579
05-28-2010, 11:02 AM
4. ### Help on comparing mean to distribution values

Hi all, I'm new here -- I'm tutoring a student in Probability/Statistics, and I've come across a type of problem that I can't recall how to solve....

• Replies: 7
• Views: 3,780
06-17-2010, 11:55 AM
5. ### Normal distributions

I have been using my TI 84 Plus Silver Edition calculator to try and figure this out with no luck :-( Can anyone help? Assume that the heights of...

• Replies: 7
• Views: 5,888
07-15-2010, 01:58 PM
6. ### Probability Question

Hello, I need a wee help with this question... "A company that repair computers go with the next sale: If the waiting time of a customer for...

• Replies: 7
• Views: 2,610
BGM
08-04-2010, 11:11 AM
7. ### regression of multple populations in one dataset

Hi, I have a dataset (x,y) that contain several populations with their own trends. I would want to perform regression on each one separately, but...

• Replies: 7
• Views: 3,607
08-31-2010, 09:00 AM
8. ### Die throwing game

A fair die is thrown a number of times and every time we count the number of dots (cumulative), until the total number of dots is bigger than or...

• Replies: 7
• Views: 4,829
09-10-2010, 02:37 PM
9. ### Normal Distribution

Hi, I ask this question in relation to a commerce project which I am working on in regards to the probability distributions of operating profits. ...

• Replies: 7
• Views: 3,477
09-14-2010, 11:54 AM
10. ### Doesn't "At least" mean greater than

Thank you for taking the time to read my question :) I was given a question that reads: We would like to test whether the percentage of students...

• Replies: 7
• Views: 36,649
09-27-2010, 10:35 AM
11. ### Finding E[X] and Var[X] of exponential distribution

Transistors produced by one machine have a lifetime which is exponentially distributed with mean 100 hours. Those produced by a 2nd machine have an...

• Replies: 7
• Views: 10,224
10-19-2010, 12:23 PM
12. ### cant decide null and alternative

. Last fall, a sample of n= 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate...

• Replies: 7
• Views: 4,939
10-21-2010, 06:41 AM
13. ### Transition Probability

Hi. I have a question about transition probability. Q) Markov chain on states {0,1,2,3,4,5} has transition probability matrix (which is 6 by 6...

• Replies: 7
• Views: 4,438
11-03-2010, 05:46 PM
14. ### Easy Probability Question

Hi. I have an easy probability question. If you flip a coin 50 times, what is the probability of getting 70% heads? Sorry this is so easy,...

• Replies: 7
• Views: 2,896
11-04-2010, 05:05 PM
15. ### Minimum of 2 Random Variables question

R(1) and R(2) are 2 independent random variables with same density function f(x) = x*(e^(-.5 * x^2)) for x >= 0. Find the density of Y = min{R(1),...

• Replies: 7
• Views: 13,854
11-05-2010, 11:13 PM
16. ### CJD problem

In a large corporation, people over age 30 have an annual income whose distribution can be approximated normally ~ ($60K,$100,000,000) with SD =...

• Replies: 7
• Views: 3,218
BGM
11-14-2010, 08:19 AM
17. ### help with exponential distribution

X1,X2,...,XN are independently identically exponentially distributed with expected value of 5. How can I compute Xn when n=20 and N=1000? Then...

• Replies: 7
• Views: 6,343
11-30-2010, 12:13 AM
18. ### Simple Probability Question

Hi. I have a simple probability question: Not counting the greens, what are the odds of getting 19 of the same color in a row in roulette? ...

• Replies: 7
• Views: 3,422
12-02-2010, 12:44 PM
19. ### Normal distribution question

X is normally distributed with mean 100 and variance 81. What is the probability that X will lie between 88 and 112? Here is my approach:...

• Replies: 7
• Views: 4,479
01-12-2011, 05:28 AM
20. ### Comparing Gaussian curves

Hi, I have two points A(30.333,100) and B(30.333151665,80) I need to draw Gaussian for each point separately and need to check their overlap...

• Replies: 7
• Views: 9,161
08-31-2011, 05:35 PM
21. ### Probability of event

Hello Friends I'll try to ask in very simple way I will have multiple choice test next month and i have 240 questions every question has 3...

• Replies: 7
• Views: 3,560
03-08-2011, 02:06 PM
22. ### Looking for assistance with random prize probability among family

Hello all, I signed up specifically in search for some assistance in a real world problem, hope that's alright. We have an application that...

• Replies: 7
• Views: 2,943
06-29-2011, 11:55 AM
23. ### wishart distribution and correlation matrix???

hey there everyone! just a quick question.... you see how the sampling distribution of the covariance matrix follows a wishart distribution (for...

• Replies: 7
• Views: 8,982
Lep
09-16-2013, 03:01 AM
24. ### Probability - transformation of random variable

In an analog to digital conversion an analog waveform is sampled, quantized and coded. A quantized function is a function that assigns to each sample...

• Replies: 7
• Views: 4,160
05-05-2011, 11:02 AM
25. ### Poisson Question

I'm not a stat guy by any means, so I want to check my thinking here. Let's say a football player scored 11 Touchdowns in 16 games for an average...

• Replies: 7
• Views: 2,682
06-01-2011, 07:02 PM
26. ### Probability Problem

Apologies if my terminology is bad, I haven't done any statistics for years. If this thread is posted in the wrong place, sorry I am new to this...

• Replies: 7
• Views: 2,478
BGM
07-28-2011, 11:46 PM
27. ### Finding the max and min P-value from an F-tets

There is a following task in my econometrics HW: 1) I have 25 values of the {X} random value. First I find the variation, then the estimation for...

• Replies: 7
• Views: 8,976
BGM
09-30-2011, 07:28 AM
28. ### probability, independent or dependent

Hello. I roll a dice twice. Let's say that A = odd number on first, B = even number on second, C = sum is odd. Now, I need to calculate P(A),...

• Replies: 7
• Views: 3,188
10-10-2011, 09:56 AM
29. ### Uniform and Independent Probability (Simple Problem)

Hey there, I have a quick question. The problem: 3 numbers, say X, Y, and Z are chosen from a set of numbers (1 to n) where n is greater or...

• Replies: 7
• Views: 3,356
10-12-2011, 08:17 AM
30. ### Binomial Probability, Real Limits, X=0

Can someone have guessed on quiz and got all 50 questions wrong, but still get 100%? Thanks in advance! :D

• Replies: 7
• Views: 4,469
BGM
10-16-2011, 04:36 PM
31. ### method of moments and MLE question

Hello all, I have a question regarding a problem asking to obtain an estimator for theta using MLE and method of moments and then to compute the...

• Replies: 7
• Views: 5,658
10-29-2011, 08:48 PM
32. ### Help with a problem.

Problem: 2. Photocards-R’-Us is a photo card printer. For this year, they have found that 10% of the cards they make are of inferior quality (blurred...

• Replies: 7
• Views: 2,391
11-27-2011, 07:40 AM
33. ### normal distribution

Please explain me how to do that? What is the probability that a worker at Random drives more that 15 miles to work if the distribution of all...

• Replies: 7
• Views: 2,260
12-03-2011, 05:21 PM
34. ### (Simple?) probability question...

Three coins. One is fair; one is two-headed; one is two-tailed. We pick a coin at random, flip it, and it comes out heads. The probability that...

• Replies: 7
• Views: 2,374
12-15-2011, 12:05 PM
35. ### Combining 2 transitional probability matrices?

Hello, How would you/or is it possible to combine two transitional probability matrices? Say for example I have 2 matrices that both measure...

• Replies: 7
• Views: 2,122
02-22-2012, 07:21 AM
36. ### 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: 6,001
02-06-2012, 09:27 PM
37. ### Probability different colored balls picked without replacement "at least one of each"

Hello everyone. I am a hobby programmer working on a cool new project. I've always loved probability and always wanted to write a program using it...

• Replies: 7
• Views: 10,015
02-19-2012, 07:38 AM
38. ### Chi-Square distribution problem

So my professor started doing stuff with the chi-square distribution this week and I've been lost for almost the entire time. Consider a random...

• Replies: 7
• Views: 9,594
02-18-2012, 05:50 PM
39. ### Probability of a team making the finals

Hi, I am trying to find how to calculate the probability of "x" number of events happening within "y" opportunities. However each opportunity has...

• Replies: 7
• Views: 2,024
02-28-2012, 09:36 PM
40. ### Help me get started setting up an elementary problem for use with a monte carlo sim

I want to further understand monte carlo simulations. I have a business and I want to correctly set up a problem to find the likelihood of future...

• Replies: 7
• Views: 2,678
04-16-2012, 01:31 PM
41. ### ball drop in a maze

A ball bearing is dropped at the top of the maze (see diagram). It has a 50% chance of going left or right at each junction. Find the probability...

• Replies: 7
• Views: 4,051
04-27-2012, 02:33 PM
42. ### Difficult probability question

I've gotten this off another forum (it hasn't been solved yet), and thought you guys might enjoy this problem. I don't need it solved as it's not my...

• Replies: 7
• Views: 1,893
08-09-2012, 10:20 AM
43. ### A question about the distribution of random numbers - PART II

Thanks to BGM and Dragan, my problem posted under the thread " A question about the distribution of random numbers" now appears to be solved! The...

• Replies: 7
• Views: 1,547
09-20-2012, 05:12 PM
44. ### JaVale McGee

Hey friends. I decided that being an NBA all-star, author, rapper, actor, father, role model, PhD, and Nobel Prize winner wasn't enough. So I...

• Replies: 7
• Views: 1,739
10-05-2012, 01:10 PM
45. ### Probability of selecting buckets with items

Given n buckets, each bucket containing m items, we want to select k items. Selecting an item means that the corresponding bucket is selected too. ...

• Replies: 7
• Views: 1,939
BGM
10-09-2012, 09:05 AM
46. ### Find distribution function of Y given density function of X and Y as a function of X.

Hello! Let X have the density function f(x)=2x, 0 < x < 1 and Y = 2X + 1 Find the distribution function of Y, F_Y . I solved X =...

• Replies: 7
• Views: 2,952
BGM
12-05-2012, 01:20 PM
47. ### Expectation of iid variables

Hello I hope to get some help with this one. Let X_1,X_2 be iid random variables, both concentrated on I\subset\mathbb{R}_+. Define ...

• Replies: 7
• Views: 4,147
BGM
12-17-2012, 12:18 PM
48. ### Probability of machine failure question

Hi, While I'm an engineer, and have training in stats and probability, those aren't exactly my strong points, so I thought I'd ask you folks --...

• Replies: 7
• Views: 4,016
01-20-2013, 02:43 AM
49. ### Basic probability question

This is a probability question centered around some pseudo code, enjoy! n<-number of rows(x) max<-x for (i in 1 to n) do if x > max then...

• Replies: 7
• Views: 1,901
01-07-2013, 03:16 PM
50. ### How to calculate the probability between two normal distributions?

Using the normal distribution. Let X  N(1, 2) and Y  N(2, 3) where N(μ, variance) denotes the normal distribution with mean μ and variance . X...

• Replies: 7
• Views: 2,433
02-21-2013, 07:42 PM
51. ### Poisson

The number of pacients that get into the hospital is 36 per day. Wich is the probability that in one hour 4 pacients get in.

• Replies: 7
• Views: 2,055
05-27-2013, 07:18 PM
52. ### Game Coding: Calculating The Stat Growth Chance Over Several Levels

Hello! I'm working on a computer game, specifically character creation. The game uses an attribute growth system identical to the one in the Fire...

• Replies: 7
• Views: 2,124
07-16-2013, 02:40 PM
53. ### Probability Question

Working through an sample paper for an upcoming exam and I've been struggling with the following stock trading problem "A total of 576 such...

• Replies: 7
• Views: 1,785
07-30-2013, 11:17 AM
54. ### Poisson Distribution Question: Probability, Mean and Variance

Just Slow Down is a public awareness campaign in Winnipeg to help drivers understand the relationship of excessive speed to traffic collisions,...

• Replies: 7
• Views: 2,467
10-27-2013, 10:37 PM

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