1. a) 0.2

b) Var (W) = 1

c) E(4W^2) = 8

2. 0.085
3. a) exp(-1/2)=0.6065

b) 0.184

4. a) E(X)=5.6, so 5 patients

b) Var (X)=1.68

c) 0.255

5. a) 0.1357

b) 33.09

c) Approximately normally distributed, a bit skewed

6. a) 7/36=0.194
7. b) median=3.515