Chapter 13.2, Problem 21E

Income and internet usage. Use the following table that we presented in Example 4, relating the amount of time consumers spend shopping on the internet per month with their annual income, to answer Exercises 21–24.

Annual Income	$10+\text{ Hours}$	3–9 Hours	0–2 Hours	Totals
Above$60,000	192	176	128	496
$40,000–$60,000	160	208	144	512
Below $40,000	128	192	272	592
Totals	480	576	544	1,600

What is the probability that a consumer we select randomly either spends 0–2 hours per month shopping on the internet or has an annual income below $40,000?