Question: According to a report by Scarborough Research, the average monthly household cellular phone bill is $60. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
a. What is the probability that a randomly selected monthly cell phone bill is more than $85?
b. What is the probability that a randomly selected monthly cell phone bill is between $45 and $70?
c. What is the probability that a randomly selected monthly cell phone bill is between $65 and $75?
d. What is the probability that a randomly selected monthly cell phone bill is no more than $40?