Assume that we can estimate a project's cash flows as follows:

n	Expected Flow E(An)	Estimate of Standard Deviation n
0	-$300	$20
1	$120	$10
2	$150	$15
3	$150	$20
4	$110	$25
5	$100	$30

In this case, each annual flow can be represented by a random variable with known mean and variance. Further assume complete independence among the cash flows.

(a) Find the expected NPW and the variance of this project at i = 10%.

(b) If your risk-adjusted discount rate is 18%, is this project justifiable?