1) According to a report by Scarborough Research, the average monthly household celluar phone bill ...

  

1) According to a report by Scarborough Research, the average monthly household celluar phone bill is $73. 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 $100?

B: What is the probability that a randomly selected monthly cell phone bill is between $60 and $83?

C: What is the probability that a randomly selected monthly cell phone bill is between $80 and $90?

D: What is the probability that a randomly selected monthly cell phone bill is no more than $55?

2) Also in the above problem,

a) find the first quartile of bill

b) find the third quartile of bill

c) find the bill where 35% of bills are smaller

d) find the bill where 35% of bills are larger