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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: 31,129
09-30-2005, 09:44 AM
1. ### 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: 2,345
01-17-2017, 05:37 AM
2. ### 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: 2,893
01-16-2017, 06:35 PM
3. ### 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: 2,126
01-13-2017, 01:39 PM
4. ### 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: 3,000
01-09-2017, 08:22 PM
5. ### 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: 2,436
01-07-2017, 09:22 AM
6. ### 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: 3,196
01-06-2017, 08:40 PM
7. ### 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: 2
• Views: 3,452
01-04-2017, 11:31 AM
8. ### 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: 3,038
01-02-2017, 06:53 PM
9. ### 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: 2,981
12-31-2016, 11:09 AM
10. ### 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: 2,474
12-31-2016, 09:36 AM
11. ### 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: 2,906
12-28-2016, 08:40 AM
12. ### 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: 2,918
12-27-2016, 12:18 PM
13. ### 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: 2,339
12-20-2016, 06:11 AM
14. ### 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: 3,251
12-19-2016, 02:12 AM
15. ### 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: 3,048
12-18-2016, 11:41 AM
16. ### 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: 2,874
12-17-2016, 10:23 AM
17. ### 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: 3,506
12-16-2016, 11:02 AM
18. ### 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: 3,772
12-12-2016, 01:57 AM
19. ### 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: 3,250
12-11-2016, 07:13 AM
20. ### 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: 2,420
bkc
12-10-2016, 03:05 PM
21. ### 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: 2,468
12-10-2016, 07:37 AM
22. ### 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: 3,343
BGM
12-07-2016, 04:19 AM
23. ### 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: 2,911
12-05-2016, 02:03 PM
24. ### statistic question help

hello :) really need help with something. If person A makes an event once every 50 days, and person B makes an event once every 30 days (the...

• Replies: 0
• Views: 2,180
12-02-2016, 10:12 AM
25. ### Computer game log normally distributed

I'm playing a computer game and I want to boost the high score. I assume that attempts are independent (say, you do not improve by playing), and in...

• Replies: 0
• Views: 2,396
11-29-2016, 03:45 PM
26. ### 5 letter palindrome

Hello, I need help with these two questions. In a 5 letter word (out of 26): 1) What is the probability that L,E and D won't appear? 2) What...

• Replies: 1
• Views: 3,373
11-27-2016, 01:10 PM
27. ### S1 Statistics question help! Majorly stuck

Hi I have 3 statistics questions that I would like help with, 1. When Albert eats in a certain restaurant, he always eats either chicken or beef...

• Replies: 0
• Views: 2,944
11-24-2016, 02:18 PM
28. ### What distribution is better in these situations?

I'm new in statistics and probability and I'm a little lost about what distribution is better in these situations: If a tumor is malignant or...

• Replies: 3
• Views: 2,997
11-22-2016, 04:40 PM
29. ### Process capability analysis (Individuals)

Good morning, i'm working with data following a normal distribution and my purpose is to estimate the capability of my method by measuring Cp and...

• Replies: 1
• Views: 3,021
11-21-2016, 08:22 AM
30. ### How to find expectation of continuous random variable using indicator?

Let's take a simple example. X ~ Uniform . We know E(X) is 1 using the standard formula. But how to find this using indicator function?

• Replies: 2
• Views: 2,979
11-19-2016, 01:36 PM
31. ### Two approaches to the same problem in probability

Hello all I have this question: Two basketball players shoot the ball. The probability of the first one to succeed is 0.8, and the probability...

• Replies: 0
• Views: 2,769
11-19-2016, 03:01 AM
32. ### Probability from sample and sub-groups

Greetings! I was trying to determine probability of soccer tryout success. In Maryland, there are 5,300 boys in this group. There are 320 teams...

• Replies: 0
• Views: 3,217
11-15-2016, 01:51 PM
33. ### Carnival game of Under-Or-Over 7?

I am sorry lmao.

• Replies: 1
• Views: 3,212
11-15-2016, 11:24 AM
34. ### Sudokua problem using related binomial distribution

It is given: If you succeed to solve a Sudoku with probability 0.4 and you try many times, how likely is it that you succeed twice before you...

• Replies: 0
• Views: 2,837
11-15-2016, 07:51 AM
35. ### The probability that I am missing only one tile

Background I recently became fascinated (really!) in this probability problem. I have done quite a bit of work to figure out the answer...

• Replies: 0
• Views: 2,178
11-14-2016, 10:38 PM
36. ### Distribution function of an exponential random variable

Let Y ⇠ Exp(2) be the size of an insurance loss. If the insurance company pays min(Y, 4), what is the variance of that payment? I know that lambda...

• Replies: 3
• Views: 3,015
11-14-2016, 05:41 PM
37. ### Resulting expected value of a bounded exponential pdf

I need to determine the distribution function of an exponential random variable with mean 2, given that its outcome is larger than 2 and give the...

• Replies: 0
• Views: 2,788
11-14-2016, 01:44 PM
38. ### Probability Question

An ice cream company makes ice cream bars on sticks which sell for 10 cents. Suppose that the company puts a star on every 50th stick; anyone who...

• Replies: 1
• Views: 2,826
11-14-2016, 08:47 AM
39. ### Probability of observing mean difference/compute ranksum

Hi everyone, would appreciate some help on these three questions. If possible with calculations so that I can understand more easily! Suppose the...

• Replies: 0
• Views: 3,525
11-10-2016, 03:07 PM
40. ### Ratio of chi squared distribution.

U_1 and U_2 are both \chi^2 distribution with 1 and 2 degrees of freedom respectively. Both U_1 and U_2 are independent. Denote \frac{U_1}{U_2} by X....

• Replies: 1
• Views: 3,248
11-09-2016, 09:31 AM
41. ### Standard Normal Distribution

Z ~ N(0,1) How to show that Z\stackrel{d}{=} -Z and \frac{Z^2}{2} ~ gamma(\frac{1}{2})? Also how to show that only the standard normal...

• Replies: 4
• Views: 3,280
11-04-2016, 09:25 AM

Hi everyone, I joined the forum just to ask this question about one issue I'm having with probability. Your help is much appreciated. I already...

• Replies: 0
• Views: 2,530
11-01-2016, 09:21 PM
43. ### Average Probablities over a quarter

Hi all, I have the following probability data for a medical event, I need to find what was the overall probability for these three month? 1-...

• Replies: 1
• Views: 2,601
10-31-2016, 01:48 PM
44. ### Roulette Probabilities

Did it wrong... delete

• Replies: 0
• Views: 3,133
10-30-2016, 06:53 PM
45. ### Probibilities on opening hand at bridge

Hi all bridge lovers! Bridge is a wonderful and very complex card playing game with thousands of books written about it. For those who do not...

• Replies: 0
• Views: 2,122
10-25-2016, 02:56 PM
46. ### Emperical Rule

In finding the upper and lower bound with 95% confidence, I input numeric data and use descriptive stat on excel for mean and standard deviation....

• Replies: 0
• Views: 2,969
10-21-2016, 11:21 PM
47. ### NFL Win Probabilities

Check out this site that keeps track of all the probabilities of the big NFL stat models: http://trevorbischoff.com/2016-amos-nfl-predictions/

• Replies: 0
• Views: 3,843
10-19-2016, 04:45 AM
48. ### Definition of random variable with respect to event space

It is given that: We toss two dice with sample space Ω = {(i, j), 1 ≤ i, j ≤ 6} and the σ-algebra is generated by the events Ak = {(i,j) :...

• Replies: 7
• Views: 3,693
10-18-2016, 07:26 AM
49. ### Conditional Monthly Risk Calibration for a trading model

Hi, I have a trading system with a portfolio of assets (long and shorts) with daily market returns. I want to overlay a risk management to my...

• Replies: 0
• Views: 2,269
10-13-2016, 12:13 PM
50. ### Probability

What are the odds of miss by one all lottery number. In my country the lotto is 38C6. Let say the winning number were: 06, 11, 18, 26, 30, 33 ...

• Replies: 1
• Views: 2,594
10-11-2016, 03:57 PM
51. ### Limiting Distribution question

Let X1,......,Xn ~ Uniform (0,1). Let Yn = X bar n ^2. Find the limiting distribution of Yn. We know that whenever a random variable has a...

• Replies: 2
• Views: 4,346
10-11-2016, 03:38 PM
52. ### Binomial Probablity Distribution exactly one & and at least one.. check my answer

Your favorite baseball player has a 0.300 batting average (that is, he averages three hits for every 10 times he is up to bat). If he is up to bat...

• Replies: 3
• Views: 2,667
10-11-2016, 02:35 PM
53. ### Normalized Z-Table Questiong Is this right having problem with final answer

The amount of time it takes to produce a part is normally distributed with a mean equal to 10 second and standard deviation equal to 2 seconds. Fine...

• Replies: 2
• Views: 2,726
10-10-2016, 07:43 PM
54. ### Travelling

Hi, Still on my quest to sort probabilities problems involving time, I was trying to get help on this: If my car is traveling at 100 km / h in...

• Replies: 2
• Views: 2,568
10-07-2016, 01:36 AM

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