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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: 30,208
09-30-2005, 09:44 AM
1. ### Probability Question

Hello, I need help figuring out the results which are based on probability percentages. Let’s say there’s an item which you can brake down into...

• Replies: 5
• Views: 2,668
05-31-2008, 11:32 AM
2. ### Video Game Probability Stats

First off, hi! I've never been to this forum, but would like to humbly request help on something a little over my head. 1st problem at hand: ...

• Replies: 0
• Views: 4,251
06-01-2008, 01:55 AM
3. ### Card Prob.

A deck of cards has all the face cards removed - Aces, Kings, Queens, and Jacks. There are 36 left in the deck, if two cards were drawn at the same...

• Replies: 8
• Views: 3,832
06-01-2008, 05:24 PM
4. ### "Hepatitis" and "Golf" probabilities.

I'm having some trouble with these... A test for Hepatitis A is 98% accurate: if a person has Hepatitis, the test will come out "positive" with...

• Replies: 7
• Views: 6,669
06-01-2008, 06:51 PM
5. ### Coin flipping

A coin is weighted so chances of heads is 0.60 and the chances of tails is 0.40. The coin's tossed six times and the the number of heads out of six...

• Replies: 1
• Views: 3,232
06-02-2008, 03:11 AM
6. ### Golf Probability Again

This problem is really bothering me cause I can't figure it out at all...so I'm gonna try reposting it if that's ok: Harry is an employee at a...

• Replies: 4
• Views: 1,971
06-02-2008, 03:44 PM
7. ### Normal Distribution

I am currently working on this problem: Tire compnay produces tires whose diameters are normally distributed, with mean =36 inches and standard...

• Replies: 2
• Views: 1,757
06-03-2008, 11:48 AM
8. ### help with 2 PROBLEMS... THANKS!

I could use help with these two problems please. 8. Ricardo's car rental offers five different types of vehicles, compact cars (CC), midsize cars...

• Replies: 3
• Views: 5,311
06-03-2008, 04:24 PM
9. ### Probability Question

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

• Replies: 6
• Views: 4,150
06-04-2008, 01:26 PM
10. ### Probability Problem

Pls help...........:wave: My problem exercise goes like this - An employee of the records office at a certain school currently has 10 forms on...

• Replies: 74
• Views: 62,218
leo
06-04-2008, 07:00 PM
11. ### Counting question

Hey, I am not able to find the number of combination when I have 100 varaibles... with 2, I have: AB: A - B - AB = 3 combinations with 3, I...

• Replies: 2
• Views: 3,193
06-04-2008, 08:53 PM
12. ### probability

Hi My name is Angela. Can anyone help me figure out how to do this problem. I don't know where to begin. An automobile has three factories. A, B,...

• Replies: 1
• Views: 2,365
06-05-2008, 11:49 PM
13. ### Help please.... Find the expectation of the game

Hi my name is Angela. Can anyone help me with this problem please..... For \$4 a person may buy a chance at a raffle. There are 2000 tickets sold....

• Replies: 1
• Views: 2,428
06-05-2008, 11:59 PM
14. ### Yikes help!

There are two boxes, Box A and Box B. • Box A contains seven \$1 tags, six \$5 tags, four \$10 tags, two \$15 tags, and one \$20 tag. • Box B contains...

• Replies: 0
• Views: 1,759
06-06-2008, 09:05 AM
15. ### Probability

Question. Need help Please The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it...

• Replies: 5
• Views: 3,732
06-07-2008, 07:31 AM
16. ### where to start?

Not sure how to start...any help? Motorist insurance company has reviewed their files on bodily injury claims that they've paid out on accidents. ...

• Replies: 2
• Views: 2,525
06-09-2008, 09:28 AM
17. ### getting better, but another question

okay, so thanks to dragan's help, i'm starting to get this stuff, even though i'm still perplexed on the z-score when i'm looking for an answer based...

• Replies: 2
• Views: 2,098
06-09-2008, 06:51 PM
18. ### any help?

Okay, so I have a problem that I'm experiencing difficulty with and I'm curious if anyone can help me set up the equation for this problem: The...

• Replies: 3
• Views: 2,022
06-09-2008, 08:46 PM
19. ### really hard prob ques==need major help !!!

Hi guys i really need help on this question, it's so confusing, all help will be greatly appreciated ! =) so here's the question: as part of a...

• Replies: 3
• Views: 3,185
06-09-2008, 09:18 PM
20. ### probability for mortality

How do I calculate the probability of one patient ending up with kidneycancer when I follow a group of 99 patients over 15 years given that the...

• Replies: 3
• Views: 3,949
06-10-2008, 08:31 PM
21. ### Statistics noob here, in need of help!

I am doing my first stats assignment of the term and there is a question on which I need help. 1. 72% of students have text books. Among the...

• Replies: 2
• Views: 2,297
06-11-2008, 11:37 AM
22. ### Just wanted to make sure my answer was correct Point Estimate

Treament B Mean=1715 Sum of Squares=61.875 Treatment D Mean=20.125 SS=70.875 Point Estimate= 20.125-14.375=5.75

• Replies: 0
• Views: 3,368
06-11-2008, 06:03 PM
23. ### variance of probabilities

A variance is the amount of spread in a distribution, right? I keep coming up with a huge number for the variance and I'm not sure if this number...

• Replies: 4
• Views: 3,724
06-13-2008, 01:39 AM
24. ### Unrealistic to use poission when modeling calls to switchboard?

Isn't is unrealistic to use a poission distribution when modeling calls to a switchboard within, say, an 1 hour time interval? One of the...

• Replies: 2
• Views: 2,802
06-13-2008, 04:26 AM
25. ### Estimate P(F and M) by P(F), P(M)

Hi guys: I need help from stats experts. First of all I'm working in market research and no longer a student anymore. What I have are projects...

• Replies: 2
• Views: 2,545
06-13-2008, 09:34 PM
26. ### Standard Normal Distribution

Here is a question that I am trying to answer for myself. I think I figured out A alright. Anyway, here it is: In the standard normal...

• Replies: 2
• Views: 15,787
06-15-2008, 09:58 PM
27. ### Probability Problem

I am stumped on this one a bit. In 2001, the average conventional first mortgage for new single-family homes was \$245,000. Assuming a normal...

• Replies: 3
• Views: 6,185
06-16-2008, 12:50 PM
28. ### 2 Probability problems

I am taking statistics at my local community college and am ONLY doing it because it is required for a BSN degree. I am a 4.0 student, but most of my...

• Replies: 2
• Views: 6,079
06-16-2008, 03:14 PM
29. ### Credit Card Roulette - Expected Value

4 people just finished dinner and the bill arrives. The total tab is \$100. When paying for the bill what is better (for the individual): (1) split...

• Replies: 1
• Views: 4,589
06-16-2008, 04:08 PM
30. ### Probability and Stat help

I'm having trouble with my homework, can anyone figure out these problems for me? In a certain community, 35% of the families own a dog, and 20%...

• Replies: 2
• Views: 8,739
06-16-2008, 09:13 PM
31. ### How to obtain variance estimator

Suppose we have the following ml estimator for beta beta = (lambda - c(1-lambda)) / p beta and lambda are proportions, c is a constant...

• Replies: 0
• Views: 2,193
06-17-2008, 03:55 AM
32. ### Normal Distribution

This one has me puzzled a bit. Kleerco supplies an under-hood, emissions control air pump to the automotive industry. The pump is vacuum powered...

• Replies: 1
• Views: 2,924
06-17-2008, 11:14 AM
33. ### Birthday Problem

I understand the math behind the birthday problem However, intuitively, I don't quite understand why the percentages don't go up linearly? For...

• Replies: 1
• Views: 3,179
06-17-2008, 11:16 AM
34. ### Pub Probability Question

Hi, We were discussing the following in the pub and its frustrating me because I can't figure out the answer (15 years on from a maths degree), I...

• Replies: 3
• Views: 2,516
06-17-2008, 11:42 AM
35. ### need help with these 2 questions

a) Profits (denoted as X) 100 normally distributed mean value of 1.5 mi and a (s.d.) of 120,000. Calculate P (X < \$1 million) -4.66 is that...

• Replies: 3
• Views: 3,166
06-17-2008, 11:46 AM
36. ### probability question

This is probably going to seem so easy to most of you but I cannot remember how to do this problem. In one town 64% of adults have health...

• Replies: 2
• Views: 1,997
06-18-2008, 12:07 AM
37. ### probability question

I am having trouble with this question: How much would you be willing to pay for tickets to a contest in which there was a 1% chance that you would...

• Replies: 2
• Views: 2,516
06-18-2008, 06:52 AM
38. ### Exam Question Probability.

Pretty straightforward question, I just want to double check what I told a friend. She has 11 exam questions to study for, only 6 of these will be...

• Replies: 3
• Views: 5,161
06-20-2008, 01:36 AM
39. ### Probability based on Sample Size

I have a general idea of the information that I would like to calculate, but my stat skills are extremly rusty. The data I am concerened with is...

• Replies: 0
• Views: 2,699
06-20-2008, 11:36 AM
40. ### sampling normal distributions

Hello everyone, I'm a new member to the forum and just wanted to introduce myself. I also have been trying to figure out a homework question, and am...

• Replies: 5
• Views: 4,286
06-20-2008, 12:25 PM
41. ### 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: 2,809
06-21-2008, 03:07 PM
42. ### 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: 6,196
06-23-2008, 08:24 AM
43. ### Probability problem

Hello everyone, I don't know how to calculate a probability, relating a lotto game. The problem is: if I choose 10 random numbers in a 6/49 game,...

• Replies: 0
• Views: 5,090
06-23-2008, 09:10 AM
44. ### Process Capability

I am not sure if I am calculating the process capability index correctly. Here is what I have so far. Day No. Defective Bills 1 10 2 9 3 13...

• Replies: 3
• Views: 3,466
06-24-2008, 10:44 AM
45. ### First forum visit ever. Questions

I'm taking an online statistic course and am having a very hard time with it. I think my biggest problem is setting up the problems. Could someone...

• Replies: 2
• Views: 5,846
06-24-2008, 12:05 PM
46. ### Probability and distribution

I've some problem with a kind of exercise 1) There are 2 kind of error ( A and B). A and B are two independent casual variabiles that follow a...

• Replies: 0
• Views: 2,397
06-25-2008, 07:49 AM
47. ### goodness of fit

hello all, i have a question concerning goodness of fit for a set of data. Specifically, I have a large data set, and I'd like to know if the data is...

• Replies: 2
• Views: 3,254
06-25-2008, 11:51 AM
48. ### approximating binomial distribution w/ normal distribution

Hi all, I'm stuck on the following problem: The percentage of fat in the bodies of American men is an approximately normal random variable with...

• Replies: 2
• Views: 11,931
06-25-2008, 06:45 PM
49. ### What is memory/stationarity and how to check for them in a time series process?

I was wondering if anyone could explain what memory was? and how to check for memory and stationarity of a general time series process? Thanks! ...

• Replies: 0
• Views: 2,976
06-27-2008, 10:11 AM
50. ### Probability of the Sample Mean

Assume 20 oz. cola bottles are filled so that the mean amount of liquid contained in the bottle is 20 oz and the standard deviation is .12 oz. If a...

• Replies: 1
• Views: 3,139
06-27-2008, 11:15 AM
51. ### Sampling to figure most common color in M&M packet

Please disregard this post. I did not realize that my earlier post was moved over to the Stats section.

• Replies: 0
• Views: 3,452
06-27-2008, 12:55 PM
52. ### Normal probability question (tough one I think)

What is the probability that a randomly selected sample mean of n=100 will be greater than a randomly selected sample mean of n=1000? I'm not sure...

• Replies: 2
• Views: 2,305
06-27-2008, 01:33 PM
53. ### Defects

I would like to see how I can solve this problem effectively. Thanks for your help in advance. x= no of defects P(x) = prob of defects x ...

• Replies: 1
• Views: 2,281
06-30-2008, 03:49 PM
54. ### Beginner for Probability

I'm taking a statistics class that's covering probability. I'm having problems with some of my homework. I was hoping somebody could tell me what...

• Replies: 0
• Views: 3,238
06-30-2008, 09:03 PM
55. ### 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: 3,481
07-01-2008, 07:44 AM
56. ### nonstandard normal distributions

I am working a problem regarding IQ scores and am having trouble with one of the problems. I've got it figured out how to work other problems but...

• Replies: 5
• Views: 21,070
07-01-2008, 10:15 PM
57. ### 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: 4,703
07-01-2008, 11:16 PM
58. ### Need help

I have little idea of probability. I am programming a tool in C where I use random 64 bit numbers. Many people call rand() function of C library four...

• Replies: 3
• Views: 2,262
07-03-2008, 03:30 AM
59. ### Can increased promiscuity decrease STD risk? Part I.

My brother mentioned a book he had read and enjoyed. In it, a chapter was devoted to the idea that "More 'Secks' is Safer 'Secks'". An abridged...

• Replies: 0
• Views: 2,819
07-04-2008, 01:04 PM

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