Question: 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

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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