Question

A company surveyed 1000 people on their age and the number of jeans purchased annually. The results of the poll are shown in the table.

	Jeans Purchased Annually
	0	1	2	3 or More	Total
Under 12	0	79	62	39	180
12-18	17	83	101	59	260
19-25	35	54	159	52	300
over 25	37	71	139	13	260
Total	89	287	461	163	1000

A person is selected at random. Compute the probability of the following.

(a) The person is over 25 and purchases 3 or more pairs of jeans annually.


(b) The person is in the age group 12-18 and purchases at most 2 pairs of jeans annually.


(c) The person is in the age group 19-25 or purchases no jeans annually.


(d) The person is older than 18 or purchases exactly 1 pair of jeans

Answer 1