A local postal carrier distributes firstclass letters, advertisements, and magazines. For a certain day, she distributed the

Question:

A local postal carrier distributes firstclass letters, advertisements, and magazines. For a certain day, she distributed the following numbers of each type of item.

If an item of mail is selected at random, find these probabilities.
a. The item went to a home.
b. The item was an ad, or it went to a business.
c. The item was a first-class letter, or it went to a home.