According to CBS Money Watch, the average monthly household cellular phone bill is $100. Suppose 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 $127?
b. What is the probability that a randomly selected monthly cell phone bill is between $87 and $110?
c. What is the probability that a randomly selected monthly cell phone bill is between $107 and $117?
d. What is the probability that a randomly selected monthly cell phone bill is no more than $82?