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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: 30,199
09-30-2005, 09:44 AM
1. ### painted cubes

How many different ways can 3 cubes be painted if each cube is painted one color and only the 3 colors red, blue, and green are available? (Order is...

• Replies: 3
• Views: 4,607
07-30-2009, 02:49 PM
2. ### Finding distribution from MGF

Hello, I'm studying for an exam and there is a question that I'll have to know how to do but I have no idea how to figure it out. Any help would be...

• Replies: 1
• Views: 2,889
07-28-2009, 12:04 AM
3. ### probability of vaccine

In a large population, 64 % of the people have been vaccinated. If 3 people are randomly selected, what is the probability that AT LEAST ONE of them...

• Replies: 1
• Views: 2,943
07-26-2009, 05:08 AM
4. ### Combined probabilities

Hi all! I have a pretty interesting problem that I was hoping someone here could help me with. I am designing an application where a given user...

• Replies: 0
• Views: 2,771
07-24-2009, 11:59 PM
5. ### Just checking if I'm right... conditional prob

Hi, everyone :wave:. Newb to the forum here. Thanks in advance for taking a look at this! this isn't homework, so i can't confirm if the answer is...

• Replies: 1
• Views: 2,333
07-24-2009, 12:21 PM
6. ### Probability of events occuring at the same time?

Hi! I'm having a bit of trouble calculating a probability as my statistics are a little bit rusty. Basically, I have 25 independant Wireless G...

• Replies: 4
• Views: 5,850
07-24-2009, 11:24 AM
7. ### Combinatorices

Hello, I have a small question please... In a building there are 8 floors, in each floor, there are 4 flats. In each flat lives a couple ( man &...

• Replies: 1
• Views: 2,709
07-22-2009, 03:53 PM
8. ### chebishev

1) a dice is being rolled 360 times. the dice has 1 red side and 5 black. what is the upper bound to the probability of falling on a red side more...

• Replies: 0
• Views: 1,509
07-22-2009, 03:27 PM
9. ### want to understand problem and logic behind it

Hi guys, Say you have a 1/10 chance of hitting a jackpot. If you run that 1/10 probability 10 times, what are the chances you hit the jackpot...

• Replies: 1
• Views: 2,198
07-21-2009, 11:04 AM
10. ### Random Sampling of a distribution in excel

Requesting help to simplify random sampling of a distribution in excel. Givens are P50, Mean, u and sigma. Can this be accomplished with a...

• Replies: 1
• Views: 3,042
07-20-2009, 02:07 PM
11. ### Can ANYONE solve this??????

I am trying to figure out the method I should use to find the probability of picking any rank of cards (Ace through Deuce) from a standard deck of 52...

• Replies: 5
• Views: 3,034
07-20-2009, 01:15 PM
12. ### X=0 almost surely => E(X)=0

Axioms of expectation: 1. X>0 => E(X)>0 2. E(1)=1 3. E(aX+bY) = aE(X) + bE(Y) 4. If X_n is a nondecreasing sequence of numbers and lim(X_n) = X,...

• Replies: 14
• Views: 4,513
07-20-2009, 12:59 AM
13. ### New Approach

:confused::confused: I am still unable to find the probability of drawing only ONE queen if 5 cards are dealt from a standard deck of 52. I think I...

• Replies: 2
• Views: 2,084
07-19-2009, 01:24 PM
14. ### Help required in probabilitiy

• Replies: 0
• Views: 2,613
07-17-2009, 05:25 AM
15. ### Order Statistics problem

Let X1...Xn be independent, identically, distributed random variables. Determine the cumulative distribution functions of X(k),n, the kth largest of...

• Replies: 1
• Views: 2,344
07-17-2009, 01:25 AM
16. ### Calculation of Frequency

Hi, I am trying to calculate the probability of randomly picking a card (A through 2) from a standard deck of 52 + 1 joker if 5 cards are dealt. ...

• Replies: 0
• Views: 1,751
07-16-2009, 04:04 PM
17. ### Determing Return Periods

Hello users, I have a cummulative distribution (weibull) for a variable and I want to know how to calculate the return period (5, 10, 15, 20, 50...

• Replies: 0
• Views: 2,124
07-16-2009, 11:51 AM
18. ### Stochastic Processes

Hello all! I'm looking for a good beginner text in stochastic processes. Can anyone recommend one? Much thanks!

• Replies: 1
• Views: 3,578
07-16-2009, 10:29 AM
19. ### E(X) < ∞ ? What does it mean?

Let X and Y be random variables, F be a function. I have seen in a variety of contexts that they write "E(X) < ∞". What does it mean? My guess is...

• Replies: 5
• Views: 16,850
07-15-2009, 05:30 PM
20. ### Show that X+Y has a finite second moment

Prove that if X and Y have finite second moments, then X+Y has a finite second moment. Attempt: (X+Y)^2 ≤ X^2 + Y^2 + 2|XY| => E ≤ E(X^2) +...

• Replies: 3
• Views: 4,286
07-15-2009, 09:00 AM
21. ### Multiple Regression?

Hi I wonder if somebody can help me i've been hurting my head all day trying to figure out how to do this... The last time i did statistics was...

• Replies: 2
• Views: 3,466
07-15-2009, 02:31 AM
22. ### Confidence interval for binary data

Hi, I've got binary data (0 & 1's) which I represent as a average along a variable "speed". E.g. when speed is 5, the data is and I present that by...

• Replies: 0
• Views: 7,552
07-14-2009, 12:03 PM
23. ### Pareto Distribution with different percentages

I recently coded up my program to generate data that reflects a Pareto distribution but I was wondering how I should go about coding up something...

• Replies: 0
• Views: 1,986
07-13-2009, 10:04 PM
24. ### is this a renewal process?

Hi. I'm having trouble with renewal processes. I want to obtain a long run cost, and to do that, I want to prove that a process is a renewal process,...

• Replies: 0
• Views: 1,898
07-13-2009, 05:35 PM
25. ### Night Shift Rotation

There are 25 machinists employeed by a company a. if a night crew consists of 3 machinists, how many different crews are possible. (is this a...

• Replies: 0
• Views: 3,456
07-13-2009, 07:36 AM
26. ### Dividing 4 people into 4 groups

A group of 100 people are divided evenly into 4 subgroups. There are 4 friends within the groups. What is the probability that the 4 friends will...

• Replies: 1
• Views: 3,398
07-12-2009, 06:37 AM
27. ### Problem involving pdf

Let X be the random variable which measures how long a light bulb lasts. If the probability density function of X is given by: f(X) = C/(x^3) ; x...

• Replies: 4
• Views: 2,115
07-12-2009, 12:49 AM
28. ### Baye's Theorem Urn Problem

Hi, I am having some trouble with this problem: Suppose there are 3 urns. You choose one from which you will choose 2 balls from. Urn 1 has 4 red...

• Replies: 5
• Views: 5,322
07-11-2009, 10:44 AM
29. ### real estate probability

A real estate agent is showing homes to a prospective buyer. There are 12 homes in the desired price range listed in the area. The buyer has time...

• Replies: 1
• Views: 6,558
07-11-2009, 08:03 AM
30. ### defective parts

The ABC manufacturing company purchases a certain part from two suppliers (A supplier & B supplier). The parts received from the suppliers are used...

• Replies: 0
• Views: 4,389
07-10-2009, 01:29 PM
31. ### Crews of 3

There are 25 machinists employeed by a company a. if a night crew consists of 3 machinists, how many different crews are possible. (is this a...

• Replies: 0
• Views: 2,668
07-10-2009, 01:17 PM
32. ### simple conditional expectation

Hi there, I have f(x1|x2) and I want to derive: E(X1|X1>c,X2). Is it possible? Isn't the following correct?: E(X1|X1>c,X2)= ...

• Replies: 1
• Views: 2,568
07-10-2009, 12:19 PM
33. ### Envelope-letter matching problem

Suppose we have "n" envelopes and "n" letters and we put letters to envelopes at random. Let I_i = I({i-th letter matches}) =1 if the i-th letter...

• Replies: 1
• Views: 5,103
07-10-2009, 06:34 AM
34. ### Probability Question...

Hi guys, so here is the question that kinda confuses me. Total land area for a country is 9,094 km's, of this land about 4,176 km's is forested. ...

• Replies: 1
• Views: 1,932
07-10-2009, 12:43 AM
35. ### Urgent Help with Probability

Im given a graph which outlines the color of the car and the probability of a person choosing that car. White: .19 (probability) Silver: .18 ...

• Replies: 0
• Views: 1,683
07-10-2009, 12:30 AM
36. ### Probability Question

Hi everyone, I have been working on this problem and I think no solution is possible. Please check and see if maybe I am misunderstanding...

• Replies: 2
• Views: 1,864
07-09-2009, 12:01 PM
37. ### If X ≤ Y, then E(X) ≤ E(Y)

There is a theorem that says: "Let X and Y be random variables. If X ≤ Y, then E(X) ≤ E(Y)." But I don't really understand the meaning of "X ≤...

• Replies: 3
• Views: 11,820
07-08-2009, 09:09 PM
38. ### Total Probability with Multiple Events

I assume this is a simple question to answer, but it has been a long time since running through probability questions. I am basically looking for...

• Replies: 1
• Views: 4,114
07-07-2009, 08:33 PM
39. ### Probability

Trying to figure how many ways you can have 4 qualifiers out of a group of 11 if order matters and if order does not matter. Anyone help??? Thanks

• Replies: 3
• Views: 2,408
07-07-2009, 07:58 PM
40. ### Approximation to Normal Distribution

here's a question i'm working on: The times of the finishers in a local 10 km run are normally distributed with mean 61 minutes and variance 81...

• Replies: 2
• Views: 3,021
07-07-2009, 12:54 PM
41. ### Dice Question

Hey folks, this is a question i'm trying to solve: You roll a die, winning \$1 for rolling a 2 or a 4, and \$7 for a 6. You lose \$2 if the number...

• Replies: 1
• Views: 2,129
07-07-2009, 12:39 PM
42. ### Log normal distribution

Hello all, I would like to find a solution to the following problem. Consider I have a variable X log normally distributed with some expected...

• Replies: 2
• Views: 2,674
07-07-2009, 07:56 AM
43. ### Need to calculate 'best rated' (i.e. 'most credible') product from some reviews.

Hi How can we calculate the 'best rated' (i.e. most 'credible') product from review data that consists of a variable number of reviews about...

• Replies: 1
• Views: 2,205
07-07-2009, 12:13 AM
44. ### Joint and marginal pdf

Hello everyone. I need help in the following question: Let the joint distribution of X and Y be given as f(x,y)=2*exp{-(x+y)}, 0<x<y</infty a)...

• Replies: 0
• Views: 6,327
07-05-2009, 12:16 PM
45. ### Indicated probability

I need help with this. I have tried this every way I know possible. I know the answer, but can't find out how I actually get it. An airline...

• Replies: 1
• Views: 4,563
07-05-2009, 10:47 AM
46. ### independence proof

Hi, I got this problem about event independence, Let A, B, C are independent, prove or disprove that A U B and C are indepent. I tried to...

• Replies: 2
• Views: 4,560
07-01-2009, 11:34 PM
47. ### Number of bit combinations

Hi, Here's a simple question (sorry, this is probably probability 101, but I am no statistician!) I know that I can make up 2^n different...

• Replies: 3
• Views: 5,451
07-01-2009, 08:12 AM
48. ### Sampling Error Probability

Hello, This is my first time posting here, I stumbled upon this site when I was searching for information on the following problem which I...

• Replies: 3
• Views: 8,025
06-29-2009, 06:15 PM
49. ### Excel: Calc Percentiles across multiple years

Hello all, I am stuck and would love some advice. I am trying to create a graph in Excel that shows the range of a portfolio's value over a 5 year...

• Replies: 0
• Views: 3,496
06-29-2009, 10:25 AM
50. ### Expected Value of pmf

I am currently preparing for my upcoming actuary p/1 exam. The following question was in an book I am using:...

• Replies: 4
• Views: 11,901
06-26-2009, 04:09 PM
51. ### question on standard deviation?

hi i missed this on the text. does anyone know how to work this problem on a multiple choice test with 11 question each question has 4...

• Replies: 2
• Views: 3,714
06-25-2009, 12:29 AM
52. ### probability and the normal curve

I am in grad school getting a master's in education. I am currently enrolled in a stats class and I am not too good at math and definitely not stats....

• Replies: 4
• Views: 4,883
06-24-2009, 07:55 PM
53. ### how to understand this probability

Suppose there is a conditional probability density function p(x, pi| fi) which is called complete likelihood. This is a conditional joint...

• Replies: 0
• Views: 2,344
06-22-2009, 07:02 PM
54. ### Probability Model Question

Hi, if you could help me out with the question below I would really appreciate it. Thanks. A quiz consists of three True-False questions. A...

• Replies: 0
• Views: 3,270
06-21-2009, 10:39 PM
55. ### I fit a model now what do I do?

I have product usage data. Usage is measured in MB transfer, for example. I create a pareto chart of cumulative usage that reveals an exponential...

• Replies: 0
• Views: 2,002
06-18-2009, 04:08 PM
56. ### Distribution usage..?

5 games to be played. I want to find out the chances of one of the teams to reach 3 wins Lets say for example that pA=0.45&#37; team's A % of winning...

• Replies: 0
• Views: 1,910
06-18-2009, 02:25 PM
57. ### Mean & SD problems...binomial distribution

Ok, I'm rolling right along here & looking for some more guidance please :D In Davenport, IA about 56% of the days in a year are cloudy. Find the...

• Replies: 0
• Views: 2,309
06-17-2009, 12:41 PM
58. ### Another binomial problem....tell me if I'm heading in the right direction

38% of people in the US have type A+ blood. If you randomly select 5 Americans & ask them their blood type, what is the probability that exactly 3...

• Replies: 3
• Views: 2,138
06-17-2009, 11:54 AM
59. ### Binomial random variable question

I have this question that is driving me batty & I cannot figure it out. I'm taking entry level stats online & have driven to the campus a few times...

• Replies: 5
• Views: 5,328
06-16-2009, 09:34 PM

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