The heights of young American women,in inches,are Normally distributed with a mean of $\mu$and a standard deviation of $\sigma$ = 2.4.The margin of error for a 99% confidence interval is desired to be ±1 inch.What should be the sample size?

Name: The heights of young American women,in inches,are Normally distributed with a mean of $\mu$and a standard deviation of $\sigma$ = 2.4.The margin of error for a 99% confidence interval is desired to be ±1 inch.What should be the sample size?
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The Answer is D

The Heights of Young American Women,in Inches,are Normally Distributed with a Mean