The average U.S. monthly cable bill in 2012 has been reported to be $86. Assume monthly cable
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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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