Chapter 4.3, Problem 91E

Internet Access. From the document “Computer and Internet Use in the United States: Population Characteristics” (Current Population Survey) by T. File, we obtained the following percentage distribution of household income for U.S. households with Internet access.

Household income	Percentage	Event
Less than $25,000	17.1	A
$25,000–$49,999	24.0	B
$50,000–$99,999	35.0	C
$100,000–$149,999	14.1	D
$150,000 or more	9.8	E

Suppose that a U.S. household with Internet access is selected at random. Let A denote the event that the household has an income under $25,000, B denote the event that the household has an income between $25,000 and $49,999, and so on (see the third column of the table). Apply the special addition rule to find the probability that the household obtained has an income

1. a. under $50,000.
2. b. $25,000 or above.
3. c. between $25,000 and $149,999, inclusive.
4. d. Interpret each of your answers in parts (a)–(c) in terms of percentages.