According to a report by Scarborough Research, the average monthly household cellular phone bill is $60. Suppose
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?
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60 1135 a P x 85 z 220 from Table A5 the value for z 220 is 4861 P x 85 5000 4...View the full answer
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Related Book For 
Business Statistics for Contemporary Decision Making
ISBN: 978-0470910184
6th Edition
Authors: Ken Black
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