The Toronto maple leafs normally score a maximum of 4 goals in any game. their probability for goals is:

0 .20

1 .30

2 .25

3. .15

4. ?

A) what is their probability of scoring four goals?

B) Calculate leafs' mean number of goals

C) Calculate the standard deviation foe number of goals

D) assume that they win the game whenever they score 3 or more goals and lose otherwise. what is the mean number of games they expect to win ?