6. Suppose that 25% of all subscribers to a business magazine earn an income of more than $75,000. The magazine polls 20 subscribers at random to determine how much they make. a) What is the probability that none of the subscribers make more than $75,000? b) What is the probability that exactly half of the subscribers make less than $75,000? c) Find the variance of the number of people in this sample who earn more than $75,000.
6. Suppose that 25% of all subscribers to a business magazine earn an income of more than $75,000. The magazine polls 20 subscribers at random to determine how much they make. a) What is the probability that none of the subscribers make more than $75,000? b) What is the probability that exactly half of the subscribers make less than $75,000? c) Find the variance of the number of people in this sample who earn more than $75,000.
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 4ECP: Show that the probability of drawing a club at random from a standard deck of 52 playing cards is...
Related questions
Question
Transcribed Image Text:6. Suppose that 25% of all subscribers to a business magazine earn an income of more than
$75,000. The magazine polls 20 subscribers at random to determine how much they make,
a) What is the probability that none of the subscribers make more than $75,000?
b) What is the probability that exactly half of the subscribers make less than $75,000?
c) Find the variance of the number of people in this sample who earn more than $75,000.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 4 steps
Recommended textbooks for you