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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: 30,228
09-30-2005, 09:44 AM
1. ### I Need Help!!

Does anyone have any basic probability hints? I have a stats test tomorrow on probability, and am confused! I understand the basics, but getting into...

• Replies: 0
• Views: 2,610
11-15-2006, 08:18 PM
2. ### Probability ?

Assume that each year the IRS randomly audits 10% of the tax returns. If a married couple has filed seperate returns, a. what is the prob that both...

• Replies: 1
• Views: 4,732
11-15-2006, 06:01 PM

hello I really need some help.. I have a test tomorrow and Im still a little confused. MNM Corp. gives each of its employees an aptitude test. The...

• Replies: 1
• Views: 2,424
11-15-2006, 05:48 PM
4. ### confidence interval for variance

The provincial sales tax (pst) rate vary from province to province. Six of the rates are shown below. 5% 7% 8% 7% 9% 6% Compute a 95% confidence...

• Replies: 5
• Views: 2,514
11-15-2006, 09:48 AM
5. ### Probability question

I worked this out but am not confident i did it correctly. Could some one check it, and if not... please direct me. Im trying to grasp this.. ...

• Replies: 3
• Views: 3,199
11-13-2006, 05:42 PM
6. ### Probability I am stuck - help please!

Here's the question: The New York Times reported that 45 percent of the households in Manhattan District 5 participated in recycling. If 20...

• Replies: 2
• Views: 3,300
11-13-2006, 01:59 PM

Imagine that I have a bag filled with 200 milions of small balls of different colors (each color has the same number of balls). Furthermore, a ball...

• Replies: 4
• Views: 2,825
11-13-2006, 06:42 AM
8. ### Baye's Theorem

Hi, I have two questions that I am struggling with, that concern the Baye's Theorem.... 1) Mr. Smith's gardener is not dependable; the probability...

• Replies: 1
• Views: 6,402
11-13-2006, 05:01 AM
9. ### Lognormal distribution

I dont know where to begin on this one. I need to compute Q=a 50 year flood Q is lognormal distributed given Q= a 50 year flood mu=...

• Replies: 0
• Views: 3,809
11-13-2006, 02:34 AM
10. ### Help needed!! fast!

Hey guys, new to the forum. I've had this question and I'm so stuck on it. I'm not to good with probability so any feedback would be very helpful. ...

• Replies: 1
• Views: 2,663
11-13-2006, 01:42 AM
11. ### probability question

for the total population of a large southern city, mean family income is \$34,000, with a standard deviation (for the population) of \$5,000. a....

• Replies: 1
• Views: 3,697
11-11-2006, 11:31 AM
12. ### Probability/Density Curve Question

Quality control plan B calls for rejecting a battery as defective if its weight falls more than 2 standard deviations below the specified mean. ...

• Replies: 1
• Views: 3,132
11-11-2006, 02:33 AM
13. ### Expectance and Variance of Mixed Distributions

Hi, How do I get the expectance and variance of mixed variables. I can't seem to get a good exampe on this.

• Replies: 1
• Views: 9,815
11-11-2006, 02:11 AM
14. ### continous random variables

I need to find 1. the probability when X is less than or equal to 5. Given the following:- f(x) is 0.3 when x=0 0.014 when 0 is...

• Replies: 5
• Views: 2,475
11-10-2006, 05:06 PM
15. ### Can you get me started?

A television store owner figures that 45% of the customers entering the store will purchase an ordinary television set, 15% will purchase a plasma...

• Replies: 7
• Views: 5,759
11-09-2006, 07:39 AM
16. ### Poisson and a Moment-Generating Function

I have a problem that provides for the moment-generating function of a Poisson random variable, X, as M(t) = e^(mu(e^t - 1)). Then I must find the...

• Replies: 5
• Views: 3,933
11-08-2006, 08:57 PM
17. ### Probability Question

I just handed in a test and I'm wondering if I used the correct formula for the following problem; the problem stated (this is not verbatim), a...

• Replies: 7
• Views: 2,458
11-07-2006, 08:42 AM
18. ### Probability Problem

Hello, I'm having a problem with this question. In how many different ways can 6 girls and 5 boys stand in a row when all the boys have to stand...

• Replies: 1
• Views: 2,084
11-06-2006, 06:51 PM
19. ### CDF question

It is proposed to model the annual salaries X (in \$) paid to people in a particular occupation using the continuous cumulative distribution function:...

• Replies: 2
• Views: 2,097
11-06-2006, 05:49 PM
20. ### weibull distribution

How could weibull random variables be generated from a uniform random numbers generator?

• Replies: 1
• Views: 3,334
11-05-2006, 08:40 PM
21. ### A reversal of the Birthday Problem

I hope today finds you well and in good spirits. I am trying to develop a model based, in part, on the Classic Birthday Problem. Looking at...

• Replies: 0
• Views: 3,272
11-05-2006, 05:29 PM
22. ### Lottery Probability

Having a really tough time with this one. Six different winning numbers are selected at random from, 1 to 37. A player also selects six...

• Replies: 2
• Views: 3,093
11-04-2006, 01:30 PM
23. ### probability / level of significance

I dont know how to start these probs. I will be posting 3 questions. My book says level of confidence. Is this the same as level of significance. Pls...

• Replies: 2
• Views: 3,162
11-04-2006, 11:15 AM
24. ### standard deviation / level of significance.

In the manufacturing process of a particular painkiller, a machine is regulated to dispense 32 mg of caffeine per tablet. The machine will need...

• Replies: 2
• Views: 4,950
11-04-2006, 11:14 AM
25. ### Probability Question

Hi, I have two questions that I'm currently struggling with, the first one states that there are 40 red balls, 40 green balls, and 20 blue balls....

• Replies: 1
• Views: 5,065
11-04-2006, 08:27 AM
26. ### Probability help

I'm unsure of how to set up these types of problems.... help will be very appreciated, thanks in advance.... A carton of 24 light bulbs includes...

• Replies: 2
• Views: 2,997
11-03-2006, 09:48 AM
27. ### Standard Deviation problem

This is probably laughably easy, but I am doing this problem on a practice exam, and I keep getting it wrong. Question: The waiting time at a...

• Replies: 1
• Views: 2,694
11-03-2006, 09:23 AM
28. ### probability

Hello all, I'm taking my first and final Statistics course (thankfully for me!) in college and I need a little bit of help on this one: ...

• Replies: 3
• Views: 3,173
11-02-2006, 09:33 AM
29. ### probability confusion

Hello everyone!!! I don't know if im experiencing a brain-fart these days, but I just can't figure this out. Here's a problem. I have more like...

• Replies: 4
• Views: 4,661
10-31-2006, 10:34 PM
30. ### Permutations with Duplicates

I have been trying to find information about calculating permutations that include multiple duplicate items, but have only found programming source...

• Replies: 10
• Views: 22,045
10-30-2006, 03:34 PM
31. ### A problem for the statistically inclined

On the desk, you have 40 envelopes. Each contain a cash prize (unknown until opened): 5 - contain \$10,000 6 - contain \$5,000 9 - contain \$1,000...

• Replies: 3
• Views: 2,952
10-30-2006, 03:23 PM
32. ### how to find joint probability distribution of 3 variables

I am stuck in a problem. we have a red balls, b blue balls and c white balls. We are choosing n balls without replacement. How to find joint...

• Replies: 2
• Views: 9,157
10-27-2006, 09:59 PM
33. ### Probability of sequential deaths and dates

Hi all, I hope today finds you well and in good spirits. I'm trying to develope a statistical model and haven't done so in years. Any help is...

• Replies: 0
• Views: 4,181
10-27-2006, 07:13 AM
34. ### Exponential Distribution

I am in a 400 level Probabilities/Stats class at my university and am stuck on a problem relating to exponential distribution. I will list the...

• Replies: 7
• Views: 9,878
10-26-2006, 07:53 PM
35. ### Joint probability distribution functions

So a joint pdf is of the form P(X,Y) = SS f(x,y) dx dy, where 'S' is the integral symbol. I've got to cook up the pdf for f(x,y), where X and Y...

• Replies: 3
• Views: 10,335
10-25-2006, 07:34 PM
36. ### Binomialdistribution

The question is as follows: In a carnival game, a person can win a prize by guessing which one of 5 identical boxes contains the prize. After each...

• Replies: 0
• Views: 5,453
10-24-2006, 12:27 PM
37. ### Solving Complex Equation with Variable Factorials and Exponents

The Problem: A very important 20-bit message is being sent via satellite, and there is a 5% probability that any single bit will be received...

• Replies: 1
• Views: 4,242
10-24-2006, 11:15 AM

Hello I;m a little confused here this is the problem. Judge red Cartolano Disposed cases: 3037 Appealed: 137 Reversed: 12 A=appealed...

• Replies: 3
• Views: 3,207
10-24-2006, 06:51 AM
39. ### Need Help For My Test Tommorow

barry bonds of the san francisco giants had the highest batting average in the 2002 major league baseball season. his average was .370. so assume the...

• Replies: 3
• Views: 2,533
10-24-2006, 06:49 AM
40. ### reallyneedhelpwithexpectedvalues

I was wondering if anyone could help with the following: Magazine has 1,620,000 subscribers 640,000 - women 980,00 - men 30% OF WOMEN read...

• Replies: 3
• Views: 4,708
10-23-2006, 11:27 PM
41. ### i am confusing myself, pls help

I have some simple probability questions but i am confusing myself. 1.) players roll 2 dice, each with 6-equally like sides. If you were to roll...

• Replies: 5
• Views: 3,180
10-23-2006, 09:33 AM
42. ### Problem Solving

1) If both sexes are equally likely at birth, what is the probability that exactly 3 of 5 children will be girls? 2) About 8% of all rental cars...

• Replies: 1
• Views: 2,547
10-23-2006, 09:24 AM
43. ### simple coin flip problem

hi, I recently discovered this forum and I think this could help me with my stats courses... I havent received the text book yet, so my first...

• Replies: 16
• Views: 11,242
10-23-2006, 09:09 AM
44. ### Binomial Distribution Problem

I'm at work, so I don't have the problem verbatim, but it's something like this: Suppose that companies who launch products with revenue growth as...

• Replies: 0
• Views: 3,305
10-23-2006, 08:49 AM
45. ### Is this rectangular ?

Consider the following rectangular distribution f(x) = 2 , 0 < x < 1/2 = 0 , elsewhere. Please suggest whether this is a geuine...

• Replies: 2
• Views: 1,942
10-23-2006, 08:21 AM

Hi, I have a problem, I try to solve but still get stuck. Can you please read my solution and point out what my wrong points are? Xn is a...

• Replies: 0
• Views: 2,603
10-22-2006, 04:48 PM
47. ### 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: 4,673
10-22-2006, 02:53 PM
48. ### need help ASAP w/ problem.

20 balloons, 4 white, 4 green, 4 red, 4 blue, 4 yellow. 10 kids; 4 boys and 6 girls. Each kid is to receive 2 balloons. What is the probability that...

• Replies: 0
• Views: 2,139
10-22-2006, 02:20 AM
49. ### Probability Help

There are 5 problems I just can't get. The set up is that there are twenty ice cream cones with 5 flavors (cherry, vanilla, chocolate, strawberry,...

• Replies: 0
• Views: 1,939
10-21-2006, 11:07 PM
50. ### How to solve for probability

Sorry, please disregard this question. Help on this problem dealing with probability. Have the answer but not sure how to get to it: Question:...

• Replies: 1
• Views: 1,817
10-21-2006, 10:44 PM
51. ### should be a simple card problem

I'm having a tough time figuring out what seems to be a simple conditional probability problem. Three cards are drawn from a stadard deck. What is...

• Replies: 2
• Views: 2,382
10-21-2006, 03:51 PM
52. ### probability model driving me crazy

Hello and I am desperate for some help with a homework question. We have been studying the binomial model were given a problem that does not behave...

• Replies: 1
• Views: 2,154
10-20-2006, 01:18 PM
53. ### Approximately normal distribution

I am trying to figure out how to calculate QU and QL (Quarter 3 and Quarter 4). On some problems, the book tells me what Q3 and Q4 is, and on...

• Replies: 1
• Views: 3,037
10-20-2006, 08:40 AM
54. ### Probability of Death?

Each patient that receives a particular drug has a 4% chance of dying because of the medication. If 200 patients receive this drug, what is the...

• Replies: 8
• Views: 3,840
10-19-2006, 12:05 PM
55. ### Poisson

I just took an exam and not sure if I botched up on the Poisson concept which was asked several times. Possion (e^-lambda*lambda^X/X!) .5...

• Replies: 1
• Views: 2,382
10-19-2006, 06:57 AM
56. ### Keno or Lotto Revisited

Jerry, Well, you asked for a new thread ... funny thing is, we were both replying at nearly the same moment, so I had responded to the old thread....

• Replies: 3
• Views: 2,984
10-19-2006, 06:44 AM
57. ### Verification needed

Hi there, was just wondering if someone could verify if the following is correct? Thankyou Is the number of newspapers sold per month a...

• Replies: 5
• Views: 2,304
10-18-2006, 11:47 PM
58. ### hello

I need help with a few questions A carton of 12 batteries contains one that is bad. in how many ways can an inspector choose 3 of the batteries...

• Replies: 1
• Views: 1,862
10-18-2006, 11:23 AM

I do not need the answers to these questions, i just need to know how to solve them!!! please!! question 1: A board consisting of 8 members, 3 men...

• Replies: 0
• Views: 2,291
10-17-2006, 05:00 PM

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