Question

A simple random sample of 50 students is taken from a class of 300 students. In the class,
* the average midterm score is 67 and the SD is 12

* there are 72 women

Let W be the number of women in the sample, and let S be the average midterm score of the sampled students.

1 - Find E(W)
2 - Find SE(W)
3 - Find E(S)
4 - Find SE(S)

Answer 1

Find E(W) is 12, but I don't know the others. Could someone help me?

Answer 2

E(S)=11,1667

Answer 3

This E(S) is wrong

Answer 4

E(S) = 67