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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: 30,250
09-30-2005, 09:44 AM
1. ### variance of binomial distribution

The variance of a binomial distribution for which n = 100 and p = 0.20 is this is a practice problem for a test im taking next week. But i don't...

• Replies: 1
• Views: 14,503
02-23-2009, 09:46 PM
2. ### Need help with lotto problem plz

Im the Lotto, you may pick six different numbers from the set {1,2,3...,47,48}. If all six of your numbers are picked from 48, you share in a grand...

• Replies: 2
• Views: 2,114
02-23-2009, 08:35 PM
3. ### Probabilities...need help fast

i DONT UNDERSTAND THIS QUESTION.. I MEAN HOW DO I SET THIS UP.. PLEASE HELP ME.. QUESTION.. THE 10YR SURVIVAL RATE FOR BLADDER CANER IS APROX....

• Replies: 5
• Views: 2,148
02-23-2009, 01:12 PM
4. ### Probability help

In a survey of 361 people, 28 responded that they had never owned a pet. What is the probability that an individual randomly selected from that group...

• Replies: 1
• Views: 2,337
02-23-2009, 01:11 AM
5. ### population mean

100 reporters previewed a movie and were asked to rate it on a numerical scale between 0.1 and 5.0 representing the best rating. The frequency table...

• Replies: 0
• Views: 1,929
02-22-2009, 04:39 PM
6. ### Calculating probability of a given student major

First off, this is a homework question. I am completely stuck on this problem and am not sure how to answer the question. We are given a table of...

• Replies: 5
• Views: 3,257
02-21-2009, 09:12 PM
7. ### mathematical stats assignment

hi my teacher gave an assignment and said "whoever come to me with the proof solved,can get extra marks in the final report".. so help me in...

• Replies: 3
• Views: 2,645
02-20-2009, 01:21 PM
8. ### probabiliry problem under the conditional section

Please help me to solve this. i dont know where to start. 1)Suppose that in Vancouver,B.C., the probability that a rainy fall day is followed by a...

• Replies: 1
• Views: 5,268
02-20-2009, 11:12 AM

Hello everyone... I really need ur help in solving these questions.. 1) Two cards are randomly drawn from a deck of 52 playing cards. Find the...

• Replies: 3
• Views: 7,754
02-20-2009, 10:46 AM
10. ### probability problem, im confused

When turned on , each of the three switches works properly with 0.8. If a switch is working properly current can flow through it when it is turned on...

• Replies: 1
• Views: 2,678
02-20-2009, 07:45 AM
11. ### Binomial

The proportion of individuals who favor Party A in the population is 55%. How large must a sample be in order to ensure that 99% of the sample favors...

• Replies: 5
• Views: 2,975
02-19-2009, 05:40 PM
12. ### density function

I have a problem that says: If U is uniform on , find the density function of U^2. So far I have that F(y)=sqrt(y) Where do I go from there?? I...

• Replies: 2
• Views: 7,190
02-19-2009, 05:18 PM
13. ### Urgent Help!!

Good Evening everyone! I am looking for some urgent help on the following questions, so any input would be greatly appreciated. #1. It was...

• Replies: 5
• Views: 2,048
02-19-2009, 09:38 AM

A college use two different textbooks during the last semester. During last semester 0.7 students used the text book by Professor B. and 0.3 students...

• Replies: 4
• Views: 4,769
02-18-2009, 12:56 AM
15. ### Profit maximization / Random Variable

If a store owner defines total daily profit as total revenue from newspaper sales, less total cost of newspapers ordered, less goodwill loss from...

• Replies: 0
• Views: 3,058
02-17-2009, 11:40 PM
16. ### variance for 2 random variables

Studying for an intro course test and I have no one to compare it to right now.. any help would be appreciated. Here is the question. Q....

• Replies: 3
• Views: 8,712
02-16-2009, 09:52 PM
17. ### Business Stats question...desperate for help

My professor has assigned this problem and I have no idea what else to try. I have tried binomial distributions and poisson. It is in a chapter on...

• Replies: 1
• Views: 7,914
02-16-2009, 09:44 PM
18. ### What minimum sample size should relfect the distribution of the overall population

If I have exam grades for a large population (2500), what is the minimum sample/class size for which I can expect the distribution of grades for the...

• Replies: 0
• Views: 3,539
02-16-2009, 01:05 PM
19. ### How can I estimate the traffic

Hi, I'm trying to make some computer system load estimations, but I'm not sure I have all the data I need for that. I have a machine that will...

• Replies: 1
• Views: 2,649
02-16-2009, 10:14 AM
20. ### correlation and covariance

1) Suppose that two random variables X & Y are jointly distributed according to the pdf f(x,y)=8xy , 0<=y<=x<=1. What is the correlation coefficient...

• Replies: 2
• Views: 4,846
02-15-2009, 10:59 AM
21. ### can you get probability simply from a percentage?

I have this problem I'm trying to figure out regarding discrete probability distributions. If I have a percentage of either successful or failed...

• Replies: 5
• Views: 4,367
02-14-2009, 10:50 PM
22. ### indicator variables

Hi, studying for a test and registered to ask some questions.. Q) X and Y are indicator variables for events A and B. State whether XY is an...

• Replies: 1
• Views: 3,356
02-14-2009, 08:31 PM
23. ### Bivariate normal

Hi, Need some help getting started with an assignment question. We have to independant distributed random variables, X~N(10,3) and Y~N(15,24)....

• Replies: 2
• Views: 2,887
02-14-2009, 12:07 PM
24. ### normal density function

I am having trouble getting started on this problem..my textbook doesn't give a similar example for me to follow. Here is the question: Calls made...

• Replies: 3
• Views: 2,567
02-13-2009, 10:57 PM
25. ### p(r)binomial

I'm trying to figure out the probability that r=6 machines out of a sample size of n=26 would fail, given an expected failure rate in a large...

• Replies: 3
• Views: 2,727
02-13-2009, 12:49 PM
26. ### Expected number of comparisons

Hi everyone, I have the following simple program for finding the maximum of a given set L of integers while L not empty do choose y...

• Replies: 3
• Views: 2,529
02-13-2009, 10:26 AM
27. ### Confirmation?

Just wrote an exam, was able to copy down the questions along with my answers. I don't need you to solve them, but just to clarify some things. 1)...

• Replies: 2
• Views: 2,418
02-13-2009, 10:17 AM
28. ### simple stats question

In an experiment a six-sided die is rolled a number of times. The results are shown below. Die Results 1 6 2 7 3 6 4 3 5 9 6 5

• Replies: 3
• Views: 2,457
02-13-2009, 01:26 AM
29. ### Help on Stats Assignment!

hey guys, In the town of Dumparonster it is well known that garbage must be out by 8am each Monday morning and that each house in the town has a...

• Replies: 2
• Views: 2,437
02-12-2009, 12:19 PM
30. ### Variance / SD question

Apologies for what I imagine is a basic question, but I am doing some independent research and just looking to get a 'thumbs up' and confirmation for...

• Replies: 3
• Views: 1,778
02-11-2009, 05:06 AM
31. ### Forecasting help needed for google

Can someone help me with the formula I'd need in order to forecast search results? Here's the problem: Month 1: variable A increases from rank...

• Replies: 2
• Views: 2,343
02-10-2009, 07:04 PM
32. ### a short one

Hi guys, I'm new to this forum, and perhaps there already exist an answer to this question. Anyway here I go, I have an assignment in...

• Replies: 5
• Views: 2,407
02-09-2009, 08:01 PM
33. ### help?

11.32: To estimate the mean height u(mew) of male students on your campus, you will measure an SRS of students. You know from gov't data that the...

• Replies: 2
• Views: 6,481
02-09-2009, 04:08 PM
34. ### conditional expectation and variance

Hi there, Suppose X~Exp(lam). We have a sample from X of size n. Knowing that the data follow the exponential diastribution, we fit the...

• Replies: 4
• Views: 4,649
02-09-2009, 01:54 PM
35. ### X + a log X, where X~Gamma

Does anybody know anything about the distribution of X + a log X, where X is a gamma distributed random variable and a is constant?

• Replies: 7
• Views: 3,968
02-09-2009, 12:45 PM
36. ### Simulating Families of 4 Children and 5 Children

Using Excel Please help me to solve the following: 1). Estimated the probability of getting exactly 3 girls in a family of 4 children. Develop a...

• Replies: 1
• Views: 4,397
02-08-2009, 11:52 AM
37. ### variance of random variable

Hello i m new here,just searched out and find this knowledgeable forum. My teacher has given and assignment to prove the relation of variance...

• Replies: 1
• Views: 2,606
02-07-2009, 12:19 PM
38. ### help finding the poisson probabilities in this problem

ive got a word problem a need verification and help with the last part with, here it is: the number of flaws on a magnetic VHS tape produced at a...

• Replies: 3
• Views: 4,279
02-06-2009, 07:00 PM
39. ### conditional probabilities

P(A)= 0.3 P(B)= 0.5 find P(A union B) if: a) P(B|A)= 0.25 b) A is a subset of B i just need hints to solving these two, not looking for the...

• Replies: 2
• Views: 2,036
02-06-2009, 04:12 PM

The daily return of a certain stock is normally distributed with a mean of 0.30% and a standard deviation of 2.50%. 1. Find the probability that...

• Replies: 1
• Views: 2,701
02-06-2009, 01:32 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: 2,757
02-05-2009, 06:45 PM
42. ### joint density, change of variables

Need help with understanding. Two independent points dropped randomly on the interval. What is the density function of their distance x-y. I tried...

• Replies: 4
• Views: 3,859
02-05-2009, 10:38 AM
43. ### probability using combinations/permutations

a student has an exam, the teacher gives 30 questions and 10 of the 30 will be on the final exam. if the student knows how to solve 25 of the 30,...

• Replies: 1
• Views: 5,131
02-05-2009, 01:08 AM
44. ### Distribution of Sum of Independent Random Variables Having Chi-square Distributions

Hey... Ive been asked to Prove or show that one of the properties of the Chi-square distribution is true and I have no idea how to even get started....

• Replies: 1
• Views: 6,594
02-04-2009, 09:13 PM
45. ### stochatische prozesse

Hi, I was studying for my Stochastische Prozesse (german, I donīt know the name in english), examen and I came around this problem for conditional...

• Replies: 0
• Views: 1,968
02-03-2009, 03:06 PM
46. ### Expectd Value for ranges

I hope someone can help me with this expected value question: Total Number of Admissions/Probability 950,000 to 1,050,000/ ...

• Replies: 2
• Views: 2,647
02-03-2009, 02:34 PM
47. ### calculating expectation and variance

Hi, I wanted to know if i'm on the right track with this problem. So far, for expectation I multiply 15/60 and 12. Not sure if this is correct....

• Replies: 4
• Views: 5,121
02-01-2009, 02:17 PM
48. ### Poisson generation query

Hello all, (Apologies if this question is naive/obvious - I don't have much of a background in statistics/probability :() Here goes..... Say I...

• Replies: 0
• Views: 1,771
01-30-2009, 12:25 PM
49. ### how many combinations ?

4 numbers with each can be from 1 to 49. e.g. 1,2,3,4 1,2,3,5 1,2,3,6 1,2,3,7 but exclude depublication that is 2,1,3,4 or...

• Replies: 4
• Views: 3,934
01-29-2009, 10:02 PM
50. ### Are distributions the "same" in their extreme values?

Hello, I have two independent datasets which are measurements of the height of ocean waves. I would like to tell if these datasets have the same...

• Replies: 3
• Views: 3,637
01-29-2009, 02:23 PM
51. ### positions of letters in texts (coincidence?)

Hi everyone. Please excuse this stupid question but here it is anyway: What are the chances of the following occourring in a book? On page...

• Replies: 2
• Views: 2,512
01-28-2009, 07:39 AM
52. ### pmf and cdf setup

I'm having trouble with the initial setup. Could you help me construct a probability mass function? A fair coin is tossed three times. A player...

• Replies: 1
• Views: 5,389
01-28-2009, 03:46 AM
53. ### Probability Problem

William rolls a die. If he gets an even number he flips a coin. If he gets an odd number, he rolls the die again. How many possible outcomes are...

• Replies: 0
• Views: 2,204
01-27-2009, 10:15 PM
54. ### Selection w/o replacement, prob. of nth selected being mth of a set

Here's the problem, and the solutions I've attempted and come up with: In a string of 12 christmas tree lights bulbs, 3 are defective. The bulbs...

• Replies: 1
• Views: 4,634
01-26-2009, 10:31 PM
55. ### Help, please, with probability calculation in the case of a random walk of a price

Hi! I have a very specific question in calculating, having a formula or else, of the probability of a price reaching certain level. The problem is...

• Replies: 1
• Views: 3,051
01-25-2009, 11:19 PM
56. ### 2 randomly selected have same birthday

• Replies: 2
• Views: 6,479
01-24-2009, 06:51 PM
57. ### Trying to help out a teacher with this

My neighbor is an elementary school teacher and asked for my help with this, but I haven't done a math problem like this in years! She's grading...

• Replies: 1
• Views: 2,411
01-24-2009, 05:43 PM

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