Please Help!
Postini is a global company specializing in communications security. The company has
determined that 91% of all e-mails are actually spam. If you check your e-mail in the morning
and see that you have 215 new messages, what is the probability that:
a. Exactly 112 of them are spam?
b. Less than 200 of them are spam?
c.150 or more of them are spam?