Professor henry knows from past experience that 30% of all homework papers handed in will be missing the name of the person who handed it in. in a class of 200, that is a problem. what is the probability that out of 200 homework papers,
a) between 50 and 70 papers will be missing the name
b) at least 75 papers will be missing the name
c) at most 45 papers will be missing the name
d) exactly 65 papers will be missing the name