Dick's Sporting Goods has received a few complaints that the string tensions of Wilson rackets seem too high.

Dick's Sporting Goods has received a few complaints that the string tensions of Wilson

rackets seem too high. The Bloomington store manager calculates a confidence interval

for the mean racket tension of Wilson rackets. He knows that the tension is supposed to

be 63 pounds, but is not aware of the population standard deviation. He measures the

tension of 36 rackets and calculates a standard deviation of 2.2 pounds. How many

rackets must he measure to be within 0.55 pounds of the mean at a 97% level of

confidence?

Please show me the proces,thank you so much