Ok I am completely lost, can anyone help me out? I have done the first question, and the second one is based on it.

The first question said:

The parent distribution of x is normal with mean 80 and standard deviation 9.

Based on samples of size n=25, find the mean and standard error of the sampling distribution of .

I said:= 80

= 9/5

Thesecond questionis where I am lost.

It says find:

A. P(62 < x < 80)

B. P(71 < < 77)

C. x' such that P( > x') = .05