Question: The average U S monthly cable bill in 2012 has

The average U. S. monthly cable bill in 2012 has been reported to be $ 86. Assume monthly cable bills follow a normal distribution with a standard deviation of $ 9.50.
a. What is the probability that a randomly selected bill will be
1. Less than $ 80?
2. Less than $ 90?
3. Exactly $ 85?
4. Between $ 75 and $ 95?
b. Use Excel or PHStat to confirm the answers in part a.
c. Which monthly cable bill represents the 75th percentile?



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  • CreatedJuly 17, 2015
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