A university has 20,000 students. The student have ages with the following probabilities: 40% are age 18, 30% are age 19, 20% are age 20, and 10% are age 21. If a student is chosen at random, what is the student's expected age?

A university has 20,000 students. The student have ages with the following probabilities: 40% are age 18, 30% are age 19, 20% are age 20, and 10% are age 21. If a student is chosen at random, what is the student's expected age?

Name: A university has 20,000 students. The student have ages with the follo
Uploaded: 2024-03-20T07:06:41.000Z
Channel: Bartleby
Description: A university has 20,000 students. The student have ages with the following probabilities: 40% are age 18, 30% are age 19, 20% are age 20, and 10% are age 21. If a student is chosen at random, what is the student's expected age?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

See similar textbooks

Similar questions

Assume that the car lot contains 35 percent Jaguars, 30 percent Corvettes, and 35 percent Lincolns. Of the Jaguars, 80 percent have navigation systems, 10 percent of the Corvettes have navigation systems, and 50 percent of the Lincolns have navigation systems. You are assigned a car at random. If the car has a navigation system, what is the probability that it is not a Jaguar?
A couple has two children, and the older child is a boy. If the probabilities of having a boy or a girl are both equal, what is the probability that the couple has two boys?
Three percent of the students at Lincoln High are in orchestra, 5% are in band, and 1% are in both. If a student is selected at random, what is the probability that the student is in orchestra or band?
If Bart can make only 40% of free throws in a basketball game, what is the probability that he will make exactly one of the next three free throws?
Suppose 33.3% of high school students eat pizza and 42% drink soda. If 17.3% of high school students eat pizza and drink soda, what is the probability that a randomly chosen high student will either eat pizza, drink soda, or both?
Suppose that 51% of people own dogs. if you pick two people at random what is the probability that they both own a dog?
Suppose that 19% of people own dogs. If you pick two people at random, what is the probability that they both own a dog?
A bag contains 8 red marbles, 6 white marbles, and 6 blue marbles. You draw 4 marbles out at random, without replacement. Find the following probabilities and round to 4 decimal places. a. The probability that all the marbles are red is
Tom has a standard set of pool balls. If he were to draw one ball at random, what is the probability that it will be red or yellow? Give your answer in its simplest form.
A certain airline books 250 passengers for a certain flight that can seat only 212. If past studies show that only 80% of the booked passengers will arrive for the flight. What is the probability that the flight will run out of seats?