Hello, I've been asked to use Excel to solve the problem below. Need assistance with how to best answer the question in Excel. Is there a formula to enter, what exactly is the question looking for? A hint was provided below. Thank you

According to the National Survey of Student Engagement, the average student spends about 17 hours each week preparing for classes; preparation for classes includes homework, reading and any other assignments. Assume the standard deviation of time spent preparing for classes is 4 hours. If you select a random sample of 16 students:

A)What is the probability that the mean time spent preparing for classes is at least 16 hours per week?

B)There are 85% chance that the sample mean is less than how many hours per week?

C)What assumption must you make in order to sole (A) and (B)?

D)If you select a random sample of 64 students, there is an 85% chance that the sample mean is less than how many hours per week?

Hint :( Notice the variable we are dealing with is X_bar)