1. VAR(X) = 2.8

2. VAR(Z) = 1.41

3. SD(W) = 1.4 (to 2 significant figures)

4. VAR(X) = 0.5

5. VAR(X) = 0.75

6. SD(X) = 2.4 (to 2 significant figures)

7. a. k = 0.1

b. E(Y) = 5.4

c. VAR(Y) = 4.04

8. VAR(number of tails) = 0.5