# Cee 110 introduction to probability and statistics (problem 4-82 in

Phoenix water is provided to approximately 1.4 million people, who are served through more than 362,000 accounts (http://phoenix.gov/WATER/wtrfacts.html). All accounts are metered and billed monthly. The probability that an account has an error in a month is 0.001; accounts can be assumed to be independent.

Don't use plagiarized sources. Get Your Custom Essay on
Cee 110 introduction to probability and statistics (problem 4-82 in
Just from \$13/Page

(a) What is the mean and standard deviation of the number of account errors each month?

(b) Approximate the probability of fewer than 350 errors in a month.

(c) Approximate a value so that the probability that the number of errors exceeding this value is 0.05.

(d) Approximate the probability of more than 400 errors per month in the next two months.

Assume that results between months are independent.

[362, 19.0, 0.256, 392.3, 4.62×10-4]

Calculator

Total price:\$26
Our features