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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: 30,323
09-30-2005, 09:44 AM
1. ### 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: 2,164
10-22-2006, 02:20 AM
2. ### 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: 4,693
10-22-2006, 02:53 PM

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: 2,610
10-22-2006, 04:48 PM
4. ### 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: 1,957
10-23-2006, 08:21 AM
5. ### 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: 3,316
10-23-2006, 08:49 AM
6. ### 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: 11,296
10-23-2006, 09:09 AM
7. ### 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: 2,554
10-23-2006, 09:24 AM
8. ### 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: 3,203
10-23-2006, 09:33 AM
9. ### 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: 4,735
10-23-2006, 11:27 PM
10. ### 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: 2,541
10-24-2006, 06:49 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: 3,228
10-24-2006, 06:51 AM
12. ### 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: 4,272
10-24-2006, 11:15 AM
13. ### 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: 5,474
10-24-2006, 12:27 PM
14. ### 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: 10,399
10-25-2006, 07:34 PM
15. ### 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: 9,919
10-26-2006, 07:53 PM
16. ### 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: 4,210
10-27-2006, 07:13 AM
17. ### 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: 9,184
10-27-2006, 09:59 PM
18. ### 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: 2,974
10-30-2006, 03:23 PM
19. ### 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: 22,103
10-30-2006, 03:34 PM
20. ### 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: 4,713
10-31-2006, 10:34 PM
21. ### 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: 3,188
11-02-2006, 09:33 AM
22. ### 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: 2,709
11-03-2006, 09:23 AM
23. ### 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: 3,006
11-03-2006, 09:48 AM
24. ### 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: 5,109
11-04-2006, 08:27 AM
25. ### 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: 4,977
11-04-2006, 11:14 AM
26. ### 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: 3,178
11-04-2006, 11:15 AM
27. ### 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: 3,100
11-04-2006, 01:30 PM
28. ### 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: 3,374
11-05-2006, 05:29 PM
29. ### weibull distribution

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

• Replies: 1
• Views: 3,347
11-05-2006, 08:40 PM
30. ### 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: 2,103
11-06-2006, 05:49 PM
31. ### 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: 2,090
11-06-2006, 06:51 PM
32. ### 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: 2,468
11-07-2006, 08:42 AM
33. ### 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: 3,947
11-08-2006, 08:57 PM
34. ### 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: 5,776
11-09-2006, 07:39 AM
35. ### 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: 2,489
11-10-2006, 05:06 PM
36. ### 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: 9,849
11-11-2006, 02:11 AM
37. ### 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: 3,181
11-11-2006, 02:33 AM
38. ### 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: 3,724
11-11-2006, 11:31 AM
39. ### 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: 2,675
11-13-2006, 01:42 AM
40. ### 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: 3,845
11-13-2006, 02:34 AM
41. ### 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: 6,432
11-13-2006, 05:01 AM

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: 2,850
11-13-2006, 06:42 AM
43. ### 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: 3,313
11-13-2006, 01:59 PM
44. ### 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: 3,206
11-13-2006, 05:42 PM
45. ### 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: 2,523
11-15-2006, 09:48 AM

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: 2,436
11-15-2006, 05:48 PM
47. ### 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: 4,753
11-15-2006, 06:01 PM
48. ### 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: 2,618
11-15-2006, 08:18 PM
49. ### kurtosis

Hi, I am calculating the skewness of returns of 10,000 randomly selected portfolios with different portfolio sizes(where assets range from 2 to...

• Replies: 2
• Views: 4,750
11-17-2006, 09:47 PM
50. ### Probability Help!

I've been working on a couple of problems and I'm having a hard time figuring them out. A salesperson has 4 different types of term life...

• Replies: 0
• Views: 2,133
11-20-2006, 08:58 PM

ignore this, I have solved the problem

• Replies: 1
• Views: 2,247
11-21-2006, 12:41 AM
52. ### Probability question

In a city where 30% occupants are foreign, the probability of a foreign being questioned is 40%, while for a local is 10%. What is the likelihood...

• Replies: 2
• Views: 2,426
11-21-2006, 01:21 AM
53. ### Confidence interval, pls help

Hi could i pls get some help with these questions. I dont want the answer. I would be greatful if someone could even tell me what formula i would...

• Replies: 2
• Views: 5,632
11-21-2006, 04:04 PM
54. ### Planting Flowers

Four triangular gardening plots form a square as shown. Each plot will contain one kind of flower, and flowers in plots that share an edge will be...

• Replies: 0
• Views: 2,249
11-21-2006, 04:49 PM
55. ### I'm very confused...(Normal Distribution)

Hi people...I really should of come here sooner to try and ask for help, but I just kept letting myself sink deeper and deeper... Now I have some...

• Replies: 4
• Views: 3,182
11-21-2006, 11:14 PM
56. ### Expected value of X

R.V. X, given E(x+4)=10 and E=116, determine: Var(X+4); E(X)=mu Var(X)=sigma^2

• Replies: 2
• Views: 4,306
11-22-2006, 05:58 AM
57. ### Need some homework help. (work provided)

Hey guys my current book I am using is statistics and the author is weiss just fyi. I am real confused about a concept. here is the question. ...

• Replies: 1
• Views: 2,738
11-22-2006, 11:15 AM
58. ### Determining the test to be applied

Find the 96% confidence limits for the true mean weekly study time of students if a sample of 25 had an average of 20 hrs per week and a sd of 3 hrs.

• Replies: 3
• Views: 1,756
11-22-2006, 11:20 AM
59. ### A problem about expected value

given two variables satisfying uniformly distribution as p1~U(0,a1),p2~U(0,a2), there is a random variable defined as s=(a1*p2-a2*p1)/(p1+p2). ...

• Replies: 0
• Views: 1,916
11-24-2006, 08:00 AM

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