Question 759440: According to a report by Scarborough Research, the average monthly household cellular 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?
Answer by reviewermath(1029)   (Show Source):
You can put this solution on YOUR website! According to a report by Scarborough Research, the average monthly household cellular 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?
Enter =1-normdist(100,73,11.35,TRUE) on EXCEL, the result is  .
b. What is the probability that a randomly selected monthly cell phone bill is between $60 and $83?
Enter =normdist(83,73,11.35,TRUE)-normdist(60,73,11.35,TRUE) on EXCEL, the result is  .
c. What is the probability that a randomly selected monthly cell phone bill is between $80 and $90?
Enter =normdist(90,73,11.35,TRUE)-normdist(80,73,11.35,TRUE) on EXCEL, the result is  .
d. What is the probability that a randomly selected monthly cell phone bill is no more than $55?
Enter =normdist(55,73,11.35,TRUE) on EXCEL, the result is 
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