Estimate µ using the mean of the sample

A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to estimate the meanmonthly mileage, µ of cars rented in the U.S. over the past year. The consumer group plans to choose a random sampleof monthly U.S. rental car mileages and then estimate µ using the mean of the sample.
Using the value 700 miles per month as the standard deviationof monthly U.S. rental car mileages from the past year, what is the minimum sample size needed in order for the consumer group to be 95% confident that its estimate is within 150 miles per month of µ ?

Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).

The solution estimates µ using the mean of the sample.