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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: 31,114
09-30-2005, 09:44 AM
1. ### Simple probability

If I have: The year of eruption The month of eruption 1660 July 1682 August 1694 April 1698 January 1707 July 1737 May 1760 March

• Replies: 2
• Views: 2,259
12-03-2013, 08:48 AM
2. ### sampling based upon probability of event occurrence

I have a sampling and probability question. A sub-assembly is assembled from 2 parts, A and B. Both are molded parts that are molded with...

• Replies: 0
• Views: 2,012
12-02-2013, 03:35 PM
3. ### dependent probability question?

Hello, I had a question about how to calculate dependent probability. Calculating independent probability is easy, simply multiply the probability...

• Replies: 0
• Views: 1,363
11-30-2013, 10:36 PM
4. ### Binominal Distribution

For this kind of question would I be best using the Binominal Distribution equation? So (n!/X!(n-X)!) (p^X(1-p)^n-x) Or would another...

• Replies: 3
• Views: 1,216
11-30-2013, 04:39 AM
5. ### regions of rejection of two hypothesis of random process

deleted post

• Replies: 0
• Views: 1,515
11-29-2013, 10:25 PM
6. ### Poisson Process problem

Having a lot of trouble with Poisson processes... Can anyone get me started on this problem? Customers enter a store following a Poisson Process...

• Replies: 0
• Views: 2,237
SP7
11-29-2013, 02:49 PM
7. ### basic problem computing pdf

If I have a pdf, say X~Uniform and Y= -X, would the pdf of Y be 1/6 ? How would I get the pdf using P(-X < - y) = P(X > y) = 1 - P( X < y) = 1-...

• Replies: 2
• Views: 1,658
11-29-2013, 03:22 AM
8. ### Probability of Bed bugs from library - HELP :)

I am in court tomorrow with my landlord. I am representing myself and the landlords lawyer is trying to say I got bed bugs from the library. I...

• Replies: 1
• Views: 2,143
11-28-2013, 09:31 PM
9. ### I Need Help with Poisson Distribution Problem!!

I don't know where to even start with this Poisson Dist. problem, can anyone help me solve this??? The Hillel Sandwich Shop specializes in...

• Replies: 1
• Views: 2,072
BGM
11-27-2013, 04:37 PM
10. ### Distribution of sum of normal and gamma random variable

Let Z = X + Y where X \sim N\left(\mu, \sigma^2 \right) and Y \sim \Gamma\left(k, \theta \right) using this parametrization of the Gamma...

• Replies: 0
• Views: 2,465
11-27-2013, 10:07 AM
11. ### Discrete Random Variable

Hey all, I have a Discrete Random Variable taking on values x= 1,3,3^2,3^3,...3^m and f(x)=P(X=x)=c/x for some constant c, find value of c. How...

• Replies: 21
• Views: 3,929
11-27-2013, 09:12 AM

question is asking: if X~N(µ,σ)=N(K,5), find K if P(X≥6)=.9; if X~N(5,k) find K if P(X≥5)=.9 Not sure how to interpret or even begin to solve...

• Replies: 1
• Views: 1,758
11-27-2013, 09:08 AM
13. ### probability of finding 2 random DNA fragments matching between genomes

Hi all, I have a question about probabilty. There are 2 genomes (a long string, composed of 4 letters: A, T, G & C), each 150,000 bases (letters)...

• Replies: 4
• Views: 1,785
11-27-2013, 08:45 AM
14. ### Another Die question

If one was to roll a fair day and if the outcome is 2 then select a number at random in and other wise select a number at random in . if the number...

• Replies: 10
• Views: 2,179
11-27-2013, 08:37 AM
15. ### Probability of a team to score in sports

Hi All, A basic (hopefully) conditional probability question, but I can't get my head around. I want to calculate the probability based on past...

• Replies: 0
• Views: 2,379
11-27-2013, 06:28 AM
16. ### Pr (10 and a heart) - Am I overthinking this?

Hi guys, This may be way simplistic for this forum, so I apologise in advance. Drawing two cards from a standard 52 card deck. What is the...

• Replies: 3
• Views: 1,924
11-26-2013, 09:43 PM

hello,i´m new here and i´m looking for help about this problem.... well, i have 100,000 random binary sequences like this... ...

• Replies: 2
• Views: 1,578
11-26-2013, 11:13 AM
18. ### A Box containing coins question

If a box contains 4 pennies, 4 nickels, 4 dimes and 2 coins are selected at random WITH replacement and D (>=0) is the numerical difference between...

• Replies: 8
• Views: 2,363
11-25-2013, 04:37 PM
19. ### Toll booth question

If the time between successive trucks arriving at a toll booth is an exponential random variable w/ parameter theta=3 find probability that theres a...

• Replies: 4
• Views: 1,258
11-25-2013, 11:40 AM
20. ### Probability and Samples

A random sample of n=16 is selected from a normal distribution of a mean of 50 and standard deviation of 10 *what is the probability that the...

• Replies: 0
• Views: 1,501
11-25-2013, 09:53 AM
21. ### Probability and standard deviation

Dear Members, I am struggling with this particular problem and I am not sure about my answers. If anybody could verify them that would be of great...

• Replies: 5
• Views: 4,450
11-25-2013, 12:10 AM
22. ### Is there a way to simulate skewed data with only a mean and standard error?

I have a mean and its corresponding standard deviation from a skewed distribution. The original data, which I don't have, is on a likert scale from 1...

• Replies: 4
• Views: 1,328
11-23-2013, 07:36 PM
23. ### The movie, The Parallax View

Eighteen people were at a party to honor a prominent guest when that person was shot and killed. Over the next three years 1/3 of these eighteen...

• Replies: 2
• Views: 1,686
11-23-2013, 06:19 PM
24. ### Probability of finding the card?

You get shown 5 cards, which are then shuffled and placed on the table face down. The person who shuffled the cards then asks you to find a specific...

• Replies: 1
• Views: 1,241
BGM
11-22-2013, 11:22 PM
25. ### Question about Standard Normal Distribution (Finding probability)

Suppose Z is a random variable having the standard normal distribution. 1)Find the probability that Z is between 0 and (1.08 + R/10) 2)P(–w <...

• Replies: 1
• Views: 1,204
11-22-2013, 09:26 AM
26. ### Independent die roll

Hi i have this problem, where a fair die is rolled until the same number occurs 2 successive times. Let X be the trial on which the repeat occurs,...

• Replies: 14
• Views: 2,311
11-22-2013, 08:59 AM
27. ### Probability problem question

Problem: Intel is seeking 5 qualified engineers to hire. If only 3/8 of applicants are qualified what is the probability it will take exactly 20...

• Replies: 2
• Views: 1,824
11-21-2013, 12:33 PM
28. ### NEED HELP with Rayleigh distribution evercise!!

Hi all!! I have some doubts in this exercise. A RV X, has a rayleigh distribution if pdf takes the form fx(x) = x/theta (exp(-x^2/2theta)) where...

• Replies: 0
• Views: 2,079
11-21-2013, 09:34 AM
29. ### Sticky number probability

Hi I hope someone can help. I would like to know how to work out the probability of the following: 10 random draws are made. A value is...

• Replies: 0
• Views: 1,541
11-21-2013, 05:15 AM
30. ### Conditional Probability

I need help with a couple of conditional probability questions: If a person is vaccinated properly, the probability of his/her getting a certain...

• Replies: 4
• Views: 9,153
11-20-2013, 10:57 PM

please some one should help me solve this. Two four-sided die with numbers 1,…4 on the faces are thrown. Let the two discrete random variables U and...

• Replies: 2
• Views: 1,130
11-20-2013, 04:07 PM
32. ### Card Probability

Just want to make sure what im doing is correct. Out of a deck of 52 cards, 12 cards are selected at random w/o replacement, what is the...

• Replies: 3
• Views: 1,574
11-20-2013, 03:57 PM
33. ### Poussin distraction

Poisson distribution Hi guys this question has mind blanked me A call centre receives an average of 10 calls per hour. What is the...

• Replies: 6
• Views: 2,360
11-20-2013, 12:55 AM
34. ### Z-score from a negative x value

Hello, I am trying to calculate the z-score for a normal random variable(x), which has a negative value. I know the formula. If x < 3.4 the mu...

• Replies: 1
• Views: 2,838
BGM
11-19-2013, 08:58 PM
35. ### Need help for couple of statistics problems

A study showed that none of the patients treated with Malaria recovered in 50% of the cases. During a period in which 600 patients were treated, what...

• Replies: 2
• Views: 2,172
11-18-2013, 12:55 PM
36. ### How to find P(x1<x2)

X2 and x1 being 2 independent exponential variables with mean 5 and 2. I found f(x1) and f(x2) and defined y as x2 - x1 but I'm stuck there. How do...

• Replies: 7
• Views: 3,878
11-17-2013, 06:48 PM
37. ### Coin Toss

Hi, There are three people, A, B ,C, tossing a coin. The first one to get heads wins, they toss in succession in the order ABC, show the...

• Replies: 5
• Views: 2,611
plm
11-17-2013, 11:54 AM
38. ### expectation proof question

bit stuck on this proof. if P(X>=a)=0, then proof E(X) <a. try to use the expectation int(xf(x) but getting no where. any suggestion?

• Replies: 3
• Views: 2,932
11-16-2013, 01:05 PM
39. ### Percent probability

problem solved

• Replies: 3
• Views: 1,664
11-16-2013, 10:11 AM
40. ### Probability of 11 Cards with joker

Hello, this problem is a little tricky for me. Can you help me? I have a 11 cards deck composed of ten cards from 0 to 9 and one Joker. (that can...

• Replies: 0
• Views: 1,778
11-16-2013, 08:13 AM
41. ### Help

Problem solved

• Replies: 0
• Views: 1,160
11-15-2013, 11:06 PM
42. ### binary sequence statistics

Hi all, I have a problem. Supose a random sequence: 011000101010101_? I want to find the probability of next number comes 0 or 1. So i want to...

• Replies: 0
• Views: 1,271
11-15-2013, 09:48 AM
43. ### Roulette Question

Hi First time user here Can anyone supply a formula for the following please? I want to run a game of bingo but use a roulette wheel to...

• Replies: 2
• Views: 1,495
11-15-2013, 04:28 AM
44. ### Independent Events

Hello, Can anyone assist with this tricky problem ? A and B are two independent events such that: P(A)+P(B)=t, where t is a number in the...

• Replies: 1
• Views: 1,807
11-14-2013, 03:00 PM
45. ### condi prob question, stuck

if f(x,y)=3 from 0<x<1, 0<y<x. whats the conditional densiity function for fy(y|x<0.3)? i try to use bayer theorm and marginal density, but...

• Replies: 1
• Views: 1,454
BGM
11-14-2013, 01:00 AM
46. ### Ordinal probability question

Person A and Person B both get the integers 1, 2 ... N. They independently arrange them in to truly random order. The compare their first digits...

• Replies: 1
• Views: 1,365
BGM
11-13-2013, 10:40 PM
47. ### max of two r.v.

G = max (Z,Y) were f(Z,Y) = 1/15 0 <Z< 3 and 0<Y<5. 0 <g<3 integrating 0 to w for both variables = g^2 /15 3 <g<5 integrate 0 to 3 for x...

• Replies: 0
• Views: 1,283
11-13-2013, 08:32 PM
48. ### bias coin density question

if the density function of a bias coin is x-x^2 between 0-1. and z=0 is probability of bias coin fall on tail, z=1 is on its head, then whats...

• Replies: 2
• Views: 1,861
11-13-2013, 08:29 PM
49. ### I need some help, please

Hi, I have found some difficulty in solving this exercise. HINT: Use the fact that T/σ^2~chi-squared (n-1) and the moments of the chi-squared...

• Replies: 28
• Views: 13,637
11-13-2013, 04:10 PM
50. ### Basketball winning streak question

Can anyone please help me figure out how it was concluded that a basketball team with a projected .200% winning percentage has a 47% chance of...

• Replies: 4
• Views: 2,737
11-13-2013, 01:07 PM
51. ### Noise distribution in multi-variate signal - research question

Hello all, I could use a hand with a question holding up some research. I am trying to calculate the signal to noise ratio on a signal which is...

• Replies: 2
• Views: 1,731
11-13-2013, 11:31 AM
52. ### pdf of squared uniform over [i,k]

Suppose Z=W^2 where W is uniform

• Replies: 1
• Views: 1,745
BGM
11-13-2013, 10:04 AM
53. ### Problem in Bayes' Theorem/ Conditional Probability

Hi everyone ! I'm new to this site and this is my first post. This is a problem I found in my Stats textbook under the Bayes Theorem section....

• Replies: 1
• Views: 3,453
BGM
11-13-2013, 01:21 AM
54. ### Problem of independence variables

x_1,x_2,x_3,x_4 each have poisson distribution. x_1 and x_2 are independent , x_1 and x_4 are independent, x_2 and x_3 are independent, x_3 and x_4...

• Replies: 0
• Views: 1,540
11-12-2013, 07:49 AM
55. ### Conditional probability

Hello all I need some assistance with this problem: Let A and B be two event such that: P(A|~B) = 1/2 and P(B|AUB)=2/5 Find P(B)

• Replies: 1
• Views: 1,159
BGM
11-12-2013, 06:55 AM
56. ### Example of PDF with correlation of a specific value

For example example of a pdf or pmf with correlation . It is obviously easy to find ones with 0,1,-1. But what would be a good general way to...

• Replies: 2
• Views: 2,550
BGM
11-11-2013, 10:56 PM
57. ### pdf minimum of two r.v

Suppose we have a pdf f(x,y) = (1/15) for 0 < x < 3 and 0 < y < 5 we want to calculate the pdf of K = min(x,y) for 3<k< 5, => either x or y =...

• Replies: 1
• Views: 1,272
11-11-2013, 05:52 PM

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