The average U S monthly cable bill in 2012 has The average U. S. monthly cable bill in 2012 has been

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?

The average U S monthly cable bill in 2012 has

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