Question: Suppose 0.4 of students are women and gpa for women has mean of 3 and sd 0.8; Gpa for men has mean of 2.5 and sd of 1.0. a sample size of 100 students which consist 40 women and 60 men.
Let X be the mean gpa for the sample size of 100 students.
Find E(X), and Var(X)
Please show all your work and give an explanation of steps