Forum: Probability

The number of pacients that get into the hospital is 36 per day. Wich is the probability that in one hour 4 pacients get in.

2 defending dice do battle with a attacking dice, where a can be any positive integer. The highest scoring defender die is paired with the highest...

Hi, I am new here, and my name is Jonas. I'm a CS major at a university in the Northeast US. I'm a senior and wrapping up degree requirements which...

Three gentlemen, Prof. Plum, Mr. Green, and Col. Mustard, have offended each others' honor. They will settle their dispute with a duel truel with...

So I'm independently studying for exam P/1 and ran across this question in one of the previous exams: A store has 80 modems in its inventory, 30...

I don't know how to delete the post.:(

Hello: I am in a statistical process control class and we are studying control charts. My instructor gave the following problem: For the...

I am very new to bioinformatics and statistics so trying to ask around for help. I am working with expression data from two different antibody...

Consider an experiment consisting of a repeated trial with two random Bernoulli (=binary) variables, A and B. Each trial consists of multiple...

Hi, I'm trying to solve this problem, but apparently, Im going in the wrong direction. It's a Keno Game, you choose 15 balls out of 80...

Hi, I was wondering how I could calculate this. I tried two different methods and got the same answer, but I'm not sure if I'm attacking the problem...

Hi, I have in my research 45 children who took a test twice and the score is either (correct or incorrect). I calculated confidence intervals for...

stupid question i know, but when a question asks me to identify the correct method of PB what exactly do i have to do? thanks :)

Hi all. I’m a graduate student in ops research, but my research is in the optimization side of things more so than the stochastic processes. I...

Hi there: This is my first post so please forgive me if I am in the wrong section. This is not technically "homework", but it is a question that I...

Guys, how can I find the distribution of the min between two random variables, if the two random variables are not independent?

This is a long question, so I'll put it in quotes. Sorry for the lame title, but I wasn't sure what else to call it. It's essentially a very basic...

Hai everyone, I am stuck with this exercise Arrivals to a bank automated teller machine (ATM) are distributed according to a poisson...

Hi all, I would need some help with a probability exercise. I am sure you can help me. So here it is: We have an urn which contains 1000 balls...

Hi, I have a question pertaining to the problem: The expected value of the number of customers entering a shop during a 15 minute time interval...

hi everyone, I am unable to solve this exercice can you help me please ? Exercice : Starbucks has entered into an agreement with a...

Consider a medical test for a disease, D. The test mostly gives the right answer, but not always. Say its false-negative rate is 1% and its...

A number of trials were run with a high success rate, n = 1700 & 99.9% success How can I calculate (with 95% confidence) the lowest probability of...

Hi all, Brand new to this site. I've read the posting rules, but please feel free to herd me into the correct way of doing things with this...

Hey, everyone. I'm new here, and I was just wondering what the difference is between 1-Binomcdf and Binomcdf?

So, my teacher gave me some extra credit assignment where we're supposed to make a program to find the (n, c) values of an OC Curve... We're given...

Rephrasing the scenario into a word problem for the sake of simplicity. I hope it doesn't get convoluted, but then again explaining the actual...

The Proportion of college student who take Stats is P=.22 A)If 200 college students are selected at randon, how many would you expect to take...

I created a craps (dice) model in Excel using its RANDBETWEEN function and nested IF functions. I noticed that based on theoretical probabilities I...

I'm studying for an exam tomorrow. I have last years exam from the same teacher but cannot find solutions and I am stuck! 1: An electric...

There are 10 seniors, 8 juniors, 5 sophomores and 3 frshman on student council. A committee of 6 members is formed. a.p(all seniors) b.p(3...

Hi all, I'm new to this forum and hope you guys will be able to assist with a basic probability question I can't seem to figure out. My...

Given the oldest profession is prostitution.

All my life I had been under the impression that the correlation matrix was a type of covariance matrix. They share similar features: they are...

I have a problem that I am not sure how to solve, and would appreciate any guidance, help, or direction... The problem states: Suppose the...

I am looking at several normal distributions that describe the same metric for different populations (independent). I want to find the probability...

I have to solve this exercise. Here are also my solutions but I don't know if they're correct. Let Ω ⊆ R ^ 2 a finite set of points in R ^ 2....

If I want to figure out the constant, c, for the following joint probability mass function: { c(2^(x+y))/(x!)(y!) for x is an element of...

Just checking... I mean, with the exception of some peculiar cases (e.g. one variable is a linear combination of other ones present), there is no...

Hi everybody! I have to solve this exercise. We observe a tournament of 2 ^ n players, which consists of n rounds. In each round every 2 players...

Suppose the price of a particular stock changes from day to day according to the following model. If Yn is the price of the stock on day n, then Yn =...

Hi there, There's a the problem I've been trying to solve for the past two days. I have 5 dice, each with a different number of sides. Dice A:...

This is not a homework problem so, I don't have a grader or a TA to assist. Short problem: In a randomly generated 5 digit number (including...

A study indicates that 80% of college students having cell phones send and receive text messages with their phones. A) A sample of these students of...

A teacher leaves out a box of N stickers for children to take home as treats. Children form a queue and look at the box one by one. When a child...

Professor Roberto has to take an oral examination. The grading scale is as follows: 5: = best and 1: = worst. At most he only gives the note 4. Each...

Hi! I have to do this exercise: Define a finite probabilistic Space (Ω; Pr) and 2 events A,B⊆ Ω and Pr ≠ Pr so that we can verify that ...

Hi i've found this exercise but I do not understand the solution: _________________________________________________________________ In a party c...

I'm having problems mostly with part (b) and (c). Please add every single step and side note you can - including formulas used. I greatly appreciate...

I am interested in stochastic birth-death processes at about the level of Karlin and Taylor's 1975 text. My eyes are bad so I have a hard time...

Students can download from http://personal.vu.nl/h.c.tijms/ExamQuestionsUP.pdf a collection of more than 150 probability exam questions with fully...