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

a. under $50,000.

b. $25,000 or above.

c. between $25,000 and $149,999, inclusive.

d. Interpret each of your answers in parts (a)–

(c) in terms of percentages.