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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: 19,271
09-30-2005, 10:44 AM
1. ### Different solutions when using direct calculation and Chebychev's inequality

Hi all, I have a question that I can't find answer to: I have 10 random variables X1, X2....X10 which are all independent and exponentially...

• Replies: 1
• Views: 149
02-23-2017, 06:05 PM
2. ### Fixing the low value and high value in a probabilistic simulation

Hi, When doing repeated random sampling in a monte carlo method, is there a defined procedure to fixing the low value and high value of the...

• Replies: 10
• Views: 306
02-23-2017, 03:33 PM
3. ### Probability of storm surge given parameters for hurricanes.

I've been working through some statistics problems and could use a little guidance on how to arrive at the right answer (and more importantly, why...

• Replies: 4
• Views: 235
02-23-2017, 01:00 AM
4. ### Probability of throwing n different numbers in m throws of a dice

Folks I know how to calculate the probability of throwing the same number in every throw of a dice (die, if you prefer!), and I know how to...

• Replies: 1
• Views: 117
02-20-2017, 11:03 PM
5. ### Mean waiting time due to aggregation of k poisson arrivals

Dear Experts: I want to calculate the mean waiting time due to aggregation of k arrivals following poisson process with rate #λ#. Arrivals are served...

• Replies: 1
• Views: 164
02-18-2017, 08:54 PM
6. ### Probability Question

Hi Everyone, I'm looking to calculate the probability of the time taken for a specific event. I have: The best case scenario which normally...

• Replies: 1
• Views: 152
02-17-2017, 03:41 PM
7. ### MGF of sample mean of IID poisson RVs

I am given the MGF of IID RVs as e^{\lambda(e^t-1)} and am supposed to find the MGF of their sample mean of n such RVs. I have am arriving at ...

• Replies: 5
• Views: 317
02-14-2017, 08:26 PM
8. ### Probability

(This is a question on probability, not a discussion on politics. Hate or love the President, I hope you all can respond with a mathematical...

• Replies: 0
• Views: 177
02-13-2017, 07:27 AM
9. ### probability

probability

• Replies: 1
• Views: 269
02-10-2017, 08:03 PM
10. ### Probability to draw an odd number before an even number

There's 39 numbers in a jar and we're picking them without putting them back. The probability of drawing an odd number and then an even number is...

• Replies: 3
• Views: 203
02-10-2017, 08:02 PM
11. ### Roulette - expected value

Hello, I want to calculate the expected pay-out of european roulette spins. Particularly, I want to know what is the expected pay-out at the...

• Replies: 3
• Views: 208
02-10-2017, 08:28 AM
12. ### A random variable's median and variance.

-Part a) A box from 0 to 1 of height 1. What is its median ? Interpretation/Attempt: A random variable, X, is uniform, (So that its density is...

• Replies: 0
• Views: 129
02-09-2017, 05:43 AM
13. ### What is the difference between classical and bayesian understanding of probability?

I am reading a book on monte carlo analysis and the author stresses in passing that the definition of probability used in an example in the book is...

• Replies: 22
• Views: 583
02-08-2017, 10:28 PM
14. ### Probability problem help

I need help with 2 quizes: first: ...

• Replies: 1
• Views: 199
02-05-2017, 12:59 PM
15. ### Axioms of probability and sigma additivity

The third axiom of probability states that given an infinite sequence of mutually exclusive events A1, A2, .... we have P(A1 U A2 U ...) = P(A1) +...

• Replies: 6
• Views: 444
02-03-2017, 04:06 PM
16. ### Probability of how many times one need to throw a coin to get a head twice in a row?

Hi! New here, first thread! My issue is to explain why the probability function of how many times one need to throw a coin to get a head...

• Replies: 3
• Views: 291
02-02-2017, 01:52 AM
17. ### What will be the Probability?

If a treatment for cancer has 90% success rate, the remaining 10% die. If two patients come for treatment, what is the probability that one will die?

• Replies: 0
• Views: 155
01-30-2017, 01:34 PM
18. ### normal distribution z score problem

QUESTION: A normal distribution has a mean of 70 and a standard deviation of 15. Determine the value above which 80 percent of the values will...

• Replies: 1
• Views: 216
01-29-2017, 09:55 PM
19. ### Pro / Stat Problems HELP!!!

In many cases, you can model a binary communication system as follows. A 0 or 1 is chosen as the message and the transmitter sends a signal over a...

• Replies: 0
• Views: 175
01-29-2017, 08:56 PM
20. ### Dice Total Odds Calculator

I have posted a calculator to the Google Play Store for computing the probability of obtaing a particular sum when throwing dice:...

• Replies: 0
• Views: 170
01-29-2017, 06:32 PM
21. ### Simple Z score probability

QUESTION: The monthly sales of mufflers follow the normal distribution with a mean of 1350 and a standard deviation of 250. The manufacturer...

• Replies: 0
• Views: 150
01-29-2017, 04:34 PM
22. ### Probability of Horse Racing (odds aside)

Hello In a 10 horse race - if I select two horses in the same race to run either 1st , 2nd or 3rd what are the odds of - one of the horses...

• Replies: 0
• Views: 161
Mij
01-29-2017, 12:00 AM
23. ### Need help with conditional probability with multiple trials.

So lets say, a if a tester gives me value of 40, then there is a 30% chance the machine is faulty. If the testers gives me a value of 20, there is a...

• Replies: 2
• Views: 298
01-26-2017, 08:41 PM
24. ### Doing Probability through Excel

Hi everyone! This is my first post here so I hope I am doing it correctly. So I have been given a piece of work from my university in regards to...

• Replies: 1
• Views: 277
01-26-2017, 08:22 PM
25. ### Expected value

I can't figure out how to set this up. The compilation of data is boggling my mind. Do i use the 0,1,2,3,4,5,6,7,8,9 to figure my probabilities? ...

• Replies: 4
• Views: 303
01-25-2017, 09:31 PM
26. ### Probability Homework problem

My 7-grade daughter brought this problem home today and having trouble figuring it out. Each box contains a pen with one of four colors, equally...

• Replies: 3
• Views: 419
01-22-2017, 02:49 PM
27. ### Probability advice for a rpg

Hello everyone ! The question I have will look a lot like a math problem, and I have to say, if I was a lath teacher, I would use problems like...

• Replies: 0
• Views: 270
01-21-2017, 10:23 PM
28. ### For the following example, is order meaningful or not?

Consider a hypothetical example. There are 12 tickets for a documentary film and exactly 12 people to buy the tickets (one person can buy only one...

• Replies: 0
• Views: 236
01-19-2017, 10:24 PM
29. ### Bayesian exercise

-2 down vote favorite I cant get my head round the following exercise: You are testing dice for a casino to make sure that sixes do not come up...

• Replies: 5
• Views: 365
01-18-2017, 01:56 PM
30. ### Arrival time

Suppose there are five people, let t1 be the first arrival time which van be computed from min{X1,...,X5} t2 is the time of the next and so on. and...

• Replies: 0
• Views: 265
01-17-2017, 05:37 AM
31. ### Probability question, I think

Hoping someone can tell me the kind of question I'm trying to answer, and then point me at an online calculator or formula for such problems, so I...

• Replies: 2
• Views: 354
01-16-2017, 06:35 PM
32. ### Train car: probability to have a seat

A train has got five train cars, each one with N seats. There are 150 passengers who randomly choose one of the cars. What is the probability that...

• Replies: 0
• Views: 338
01-13-2017, 01:39 PM
33. ### Spectral measure

Hi! Sry for bad english :( I have a problem: A stochastic process is identically equal to one. How does it spectral measure arranged? И на русском:...

• Replies: 3
• Views: 486
01-13-2017, 05:25 AM
34. ### Bayes Rule!

Hi, My question is: A company wishes to evaluate the effectiveness of a marketing campaign. Seventy-five percent of all customers using the...

• Replies: 1
• Views: 421
01-09-2017, 08:22 PM
35. ### Maximum likelihood estimation for exponential distribution

I would like to describe some gathered data for arrival process which seems not following Poisson distribution for people finding a job. The data...

• Replies: 0
• Views: 369
01-07-2017, 09:22 AM
36. ### Warning: I know next to nothing about stats and have a question on sample selection

Hi everyone, I am not sure if I can even articulate my problem clearly, but I need some feedback on whether my concern is valid. In order to...

• Replies: 0
• Views: 371
01-06-2017, 08:40 PM
37. ### Teaching chi² distribution

Hello, I would like to explain to students the chi²-distribution in an inutitive way but I don't know how to do it. All the videos that I watch...

• Replies: 1
• Views: 599
01-02-2017, 06:53 PM
38. ### Pair of dice, normal distribution

A pair of fair dice rolled 180 times. Use the normal approximation method to find the probability that a total of 7 occurs At least 25 times...

• Replies: 1
• Views: 467
12-31-2016, 11:09 AM
39. ### Normal Distribution

Assuming that the number of marks scored by a candidate is normally distributed, find the mean and the standard deviation, if the number of first...

• Replies: 1
• Views: 471
12-31-2016, 09:36 AM
40. ### Calculating probability to construct a random variable probability function

Hello all, I have this question and I struggle to understand what to do. "There are 2 groups of numbers: A: 2,2,3,3 and B: 5,5,6 A number is...

• Replies: 2
• Views: 469
12-28-2016, 08:40 AM
41. ### Hypothetical draft lottery

I was trying to devise an equitable MLB draft lottery system which reduces the benefit of "tanking" but heavily weighs record and has a slight...

• Replies: 0
• Views: 420
12-27-2016, 12:18 PM
42. ### picking a present box with more than one characteristicss

I have a probability problem which is simplified as following, I need to check if my solution is true: If there is a bag contains 20 of small...

• Replies: 0
• Views: 403
12-20-2016, 06:11 AM
43. ### NCA Office Pool Win Probability

Hello, I run a small NCAA office pool website where folks make predictions about the outcome of each game in a 64-team tournament that consists of...

• Replies: 0
• Views: 430
12-19-2016, 02:12 AM
44. ### Poisson process: phone calls

We assume that phone calls arrive according to a Poisson process with rate 2. If I know that up to time t = 1 there is one call only, how likely is...

• Replies: 1
• Views: 388
12-18-2016, 11:41 AM
45. ### Total and quadratic variation of a function

Let f(x)= x2−3, for x<3, x2+3, for x≥3 I need to determine the total variation and the quadratic variation of f(x) on the interval . For...

• Replies: 0
• Views: 378
12-17-2016, 10:23 AM
46. ### Solving a LogNormal Conditional expectation equation - Insurance

Hi everyone, I am a newbie here and apologize if this post is in the wrong forum. I need help to solve the following LogNormal Conditional...

• Replies: 7
• Views: 545
12-16-2016, 11:02 AM
47. ### Simple but annoying probability question

A, B and C are in three way race - If the probability of A beating B is p, and the probability of A beating C is q, what is the probability of A...

• Replies: 8
• Views: 884
12-12-2016, 01:57 AM
48. ### Number of Possible Orders

In a regional spelling bee, the 8 finalists consist of 3 boys and 5 girls. Find the number of sample points in the sample space S for the number of...

• Replies: 1
• Views: 428
12-11-2016, 07:13 AM
49. ### Probability Q help, uses combinatorics, Poisson-Distr and possibly Multinomal

Place successively and independent of each other 20 particles into 10 boxes. Hereby, each of the 10 boxes is chosen with the same probability. a)...

• Replies: 0
• Views: 373
bkc
12-10-2016, 03:05 PM
50. ### Real life probability problem

So I'm wondering if someone can solve this problem for me. Some work was done in our kitchen yesterday and the fridge had to be moved. I noticed some...

• Replies: 1
• Views: 423
12-10-2016, 07:37 AM
51. ### Distribution of X+Y of a bivariate normally distributed (X,Y)

I need to give the distribution of $X+Y$ and $X-Y$ knowing that $(X,Y)$ is bivariate normally distributed with marginal means 1, marginal variances 1...

• Replies: 1
• Views: 527
BGM
12-07-2016, 04:19 AM
52. ### Probability that an unknown system corresponds to one of two possible systems

My problem can be stated as follows: given two different systems S1 and S2, each characterized by a set of parameters, say {p1,p2,...,pN}, what's a...

• Replies: 1
• Views: 496
12-05-2016, 02:03 PM

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