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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: 30,326
09-30-2005, 09:44 AM
1. ### 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: 2,405
02-25-2011, 01:08 PM
2. ### ARL - U Chart using poisson tables?

How do you determine the average run length of a u-Chart when process is im control using Poisson tables???

• Replies: 0
• Views: 2,110
11-27-2008, 10:58 AM
3. ### arrangement problem

a class has 10 students,every student is given 3 mobile phones with 3 sim for free communication... for every sim ,a set of duplicate sim is...

• Replies: 0
• Views: 1,488
07-26-2013, 02:11 AM
4. ### Arranging letters

What is the probability that an arrangement of a, b, c, e, f, g begins and ends with a vowel.

• Replies: 1
• Views: 4,291
10-08-2008, 02:13 AM
5. ### Arrival time

Suppose there are five people, let t1 be the first arrival time which van be computed from min{X1,...,X5} t2 is the time of the next and so on. and...

• Replies: 0
• Views: 2,110
01-17-2017, 05:37 AM
6. ### Assesin expected value of X1>X2 after many permutations of not unique values

Hi all! I have following problem: I have n observed values (some of them are not unique). I permute them many times. Each time I only look at the...

• Replies: 3
• Views: 4,037
BGM
04-15-2010, 06:54 AM
7. ### Assesing normality - Amateur question

Hi everybody, (First of all, excuse my poor english : It's not my native tong). I'm working for myself on a computer programm which will deal...

• Replies: 4
• Views: 4,147
01-21-2008, 11:11 AM
8. ### Assessing goodness of fit across many variables in R in one session.

Hi all I'm just getting started in R and would like some help with the following problem which could make life easier I hope! I have data set...

• Replies: 5
• Views: 1,960
09-06-2011, 05:54 PM
9. ### Assignment Problem ((urgent))

Hey all. I am having some difficulty with one question on an assignment I have been workiing on. I am quite new to stats and I cannot find a...

• Replies: 4
• Views: 2,462
08-21-2011, 01:34 AM

I'm having a tough time with my online stat course. Very limited feedback from instructor and I feel somewhat on my own. Can someone assist with...

• Replies: 1
• Views: 1,244
11-04-2014, 12:56 PM
11. ### Assistance with Monte Carlo Method for Board GAme

Outcomes 16 cards. The cards have up to four values. I need assistance building a data set I can analyze. Simulating a starting hand, and...

• Replies: 5
• Views: 1,897
01-27-2016, 06:58 PM
12. ### Assistance with Probability example

Consider a very simple card game, there are 16 cards. The cards have 4 ranks (Jack, King, Queen and Ace) and 4 suits (Clubs, Diamonds, Hearts and...

• Replies: 0
• Views: 1,037
01-28-2016, 07:02 AM
13. ### Assistance with probability problems before exam

Hello, I am a student in International Trade and I have a Statistical exam tomorrow (in 12 hours to be precise). I would really need your help and...

• Replies: 0
• Views: 1,048
01-29-2016, 03:20 PM
14. ### Astronomer's estimate

I am trying to solve the problem but end up with no where, Please help me to solve the problem Astronomers estimate that as many as one hundred...

• Replies: 3
• Views: 2,552
09-16-2014, 03:59 PM
15. ### Asynchronis Particle Counting

I have particles incident on a detector at 1000 events/sec. My detector is turning on and off at 1000 e/s bu only for 10% of the time, asynchronis to...

• Replies: 0
• Views: 1,016
02-14-2013, 05:27 PM
16. ### At least n of

Consider a genetic mutation. For anyone that has this mutation, there is a 50% probability their child(ren) will also have it. If the child has the...

• Replies: 3
• Views: 2,019
BGM
10-21-2011, 12:14 PM
17. ### autoregressive

hi folks, i am using 2nd order autoregressive for prediction. my equation is y(t)=b1 + b2*y(t-1) + b3*y(t-2). i found the coefficients b1,...

• Replies: 3
• Views: 1,901
08-13-2008, 11:14 AM
18. ### Average probability and empirical probability

This is probably very simple. The problem I have relates to a far more complex calculation, but if I can understand the maths it will be easy enough...

• Replies: 2
• Views: 4,299
09-24-2006, 09:08 PM
19. ### Average Probablities over a quarter

Hi all, I have the following probability data for a medical event, I need to find what was the overall probability for these three month? 1-...

• Replies: 1
• Views: 2,447
10-31-2016, 01:48 PM
20. ### Average Profit

Hello, This question has been really confusing me and I was wondering if someone can help me out. The question is as follows: A large...

• Replies: 1
• Views: 3,532
10-06-2007, 06:11 PM
21. ### Average time needed..

Dear Talk Stats users, First of I'm glad I found this forum and to be part of it! To keep a long story short: I've got a problem with an exercise...

• Replies: 2
• Views: 1,427
11-02-2015, 01:27 PM
22. ### averages and probability

2. The grades in a course have an average of 72 with a standard deviation of 15. Assume they are normally distributed. a) What score is...

• Replies: 2
• Views: 2,832
06-21-2008, 03:07 PM
23. ### Axioms of probability and sigma additivity

The third axiom of probability states that given an infinite sequence of mutually exclusive events A1, A2, .... we have P(A1 U A2 U ...) = P(A1) +...

• Replies: 6
• Views: 4,570
02-03-2017, 04:06 PM
24. ### Backpropagated Probabilities

To All: First, I am not sure if backproagation is the right way to define what I am looking at, but it appears to at least take the smallest...

• Replies: 2
• Views: 1,134
11-03-2014, 10:29 PM
25. ### Backwards probability: estimate an original content from a sample

Hello, Here is my problem. In a container are between 10power5 to 10power9 unique elements, each of them could be present several times...

• Replies: 0
• Views: 1,583
05-15-2012, 11:25 AM
26. ### bag of marbles

A bag with red marbles and blue marbles has more blue than red. If you add red marbles until 1/3 of the marbles in the bag are blue; yellow marbles...

• Replies: 0
• Views: 2,656
10-04-2006, 11:33 PM
27. ### 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: 4,049
04-27-2012, 02:33 PM
28. ### ball game

sorry I got it now, thanks, can someone delete this for me?

• Replies: 0
• Views: 3,017
03-02-2010, 09:11 PM
29. ### Balls in a jar

I wonder if my approach to this is correct- Say I have a jar with 10 balls, 9 of which are green and 1 that is red. I start taking out a ball at a...

• Replies: 12
• Views: 3,045
08-27-2013, 11:14 AM
30. ### Balls in buckets ...

Suppose there are T buckets in a room. Suppose further that there are two individuals, 1 and 2, who each have B1 and B2 tennis balls, where B1...

• Replies: 4
• Views: 1,616
01-16-2013, 09:14 AM
31. ### Bartels: Cycles test of signifcance

I have this pdf doc that explains the formula of Bartels , the test of a cycle significance on a time series. I am trying to put it into excel .....

• Replies: 1
• Views: 4,442
01-22-2013, 04:03 AM
32. ### Basic (or maybe not so) probability problem/experiment/question.

I came upon an interesting probabilistic assertion in a book I'm reading. Here's the quote: "Once in a while we find co-occurrences, and we're...

• Replies: 6
• Views: 2,745
BGM
09-06-2011, 03:20 AM
33. ### Basic Combination problem

Hey guys i am really stuck on this problem: At a recent gathering there were 7 musicians, 10 teachers, and 3 accountants, all noted for their love...

• Replies: 1
• Views: 2,562
12-26-2009, 02:17 PM
34. ### basic concept check

1. If event A and B are independent, would the conditional probability of B given A=1? I say false because it should =p(B) not 1. 2. If event A is...

• Replies: 1
• Views: 1,580
BGM
01-27-2012, 03:19 PM
35. ### Basic correlation matrix question

I am new to statistics. I have a signal u(n) = .4s(n)+.7s(n-1)-.1s(n-2) +v(n) where v(n) has variance .003 E yields .4^2 +.7^2 +(-.1)^2...

• Replies: 1
• Views: 1,045
02-23-2014, 08:45 PM
36. ### basic lotto question

Hi there, I was always confused with combinations etc but in most cases I was able to find my way out. But this one is really annoying me: ...

• Replies: 1
• Views: 2,283
03-19-2011, 11:37 AM
37. ### basic probability

My assignment question gives me the following info regarding the probability of system having 3 types of defects (type A1, A2, and A3): P(A1)=...

• Replies: 1
• Views: 2,838
09-28-2008, 06:29 PM
38. ### Basic probability

Lets say that I have a population of 2^24 individuals. Each individual, including myself and friends has assigned an individual number. One of them...

• Replies: 0
• Views: 1,947
10-01-2009, 03:42 AM
39. ### Basic Probability

6 Boys and 6 Girls sit in a row at random. Find the probability that the boys and girls sit alternately. Please help me with steps to calculate in...

• Replies: 9
• Views: 4,059
10-29-2010, 03:58 PM
40. ### Basic probability

Whilst I've done pg stats (like 30+ years ago) and still use them a bit, I'm now wishing to look more closely at the basis of probability. With that...

• Replies: 0
• Views: 2,385
07-18-2011, 11:48 AM
41. ### Poll: Basic Probability 2

Four Coins are tossed together. What is probability that HEAD will appear on at least on of the four coins?

• Replies: 6
• Views: 3,187
11-01-2010, 03:28 AM
42. ### Poll: Basic Probability 3

Please help me with this question Two cards are drawn at random from a pack of cards. Find the probability that both cards are of Red Colour or...

• Replies: 6
• Views: 3,878
BGM
11-01-2010, 12:06 PM
43. ### Basic Probability help required.

Hi, Im new to the site so apologies if I haven't posted the question correctly. But here goes, I have been given this question as an example to...

• Replies: 0
• Views: 932
11-13-2015, 09:48 AM
44. ### Basic Probability Homework

We just stated to have about probability at the ongoing course. We have this Exercise which I, apparently, cannot figure out how to calculate. "...

• Replies: 4
• Views: 3,288
10-10-2011, 08:13 AM
45. ### Basic Probability Problem...

A container has 20 green & 30 red balls. Five balls are randomly drawn with replacement. Let x be the number of green balls drawn. Find the...

• Replies: 2
• Views: 2,006
05-03-2011, 07:05 AM
46. ### basic probability query

I have two datasets each with 18 unique records. I am using a randomising function to assign numbers from 1 to 18 for each table and then join them...

• Replies: 3
• Views: 2,835
12-10-2007, 10:27 AM
47. ### 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: 2,669
04-03-2006, 03:00 PM
48. ### Basic Probability Question

I have a question regarding basic proability. In the problem outlined below I am worried that I have calculated incorrectly. More specifically, I...

• Replies: 2
• Views: 4,695
10-22-2006, 02:53 PM
49. ### Basic Probability question

Hello everyone, new to statistics and new here! I'm working on a question and for the life of me cant seem to get my head round the initial steps,...

• Replies: 1
• Views: 1,461
BGM
05-17-2011, 08:50 AM
50. ### Basic probability question

f(x) = x/4 for 0<x<2 = 1- x/4 for 2<x<4 = 0 otherwise Find c1 and c2 such that probability of (c1<x<c2)=0.6 So I tried to plot the...

• Replies: 3
• Views: 1,819
BGM
10-15-2011, 03:27 AM
51. ### Basic Probability Question

If I have the following data set, Event - Failure Frequency (failures/yr) 1 - 0.12 2 - 0.50 3 - 0.50 4 - 0.29 5 -...

• Replies: 0
• Views: 1,323
06-06-2012, 06:16 PM
52. ### 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: 1,898
01-07-2013, 03:16 PM
53. ### Basic Probability Question

Hi, could anyone point out the methodology I should use the answer the question below? Your wisdom is much appreciated! Question: "Between...

• Replies: 0
• Views: 1,711
04-10-2016, 03:31 AM
54. ### Basic Probability Question Help

I need help with 2 questions: 1) In a shipment of 18 trucks to a local truck dealer, there are 4 trucks that don't have air conditioning. Assume...

• Replies: 3
• Views: 3,908
10-04-2010, 10:30 AM
55. ### basic probability questions (pictures inside) Help!

i wish i could say i knew somewhat of where to start for these problems but i dont. My teacher is not the best and the homeworks are always...

• Replies: 1
• Views: 3,852
10-16-2009, 12:07 PM

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