91Ó°ÊÓ

Given in the question that, Yoonie is a personnel manager in a large corporation. Each month she must review $16$ of the employees. From past experience, she has found that the reviews take her approximately four hours each to do with a population standard deviation of $1.2$ hours. Let$\mathrm{Î\S }$ be the random variable representing the time it takes her to complete one review. Assume$\mathrm{Î\S }$is normally distributed. Let $\stackrel{¯}{x}$be the random variable representing the mean time to complete the $16$ reviews. Assume that the $16$ reviews represent a random set of reviews.

According to the supplied facts, the manager reviews $16$ employees each month. And reviews time is approximately 4 hours for each review with a population standard deviation of $1.2$hours. Thus, the meantime for each review is $4$hours and the standard deviation is$1.2$ hours, and sample size is$16.$

The meantime for each review is $4$hours and the standard deviation is $1.2$ hours, and sample size is$16.$