A survey about social media reported that 76% of B2B marketers (marketers that focus primarily on attracting businesses) plan to increase their use of social media, as compared to 54% of B2C marketers (marketers that primarily target consumers). The survey was based on 1,338 B2B marketers and 1,708 B2C marketers. The accompanying table summarizes the results. Complete parts (a) through (d) below.

Increase Use of Social Media?	Business Focus
B2B	B2C	Total
Yes	1,019	928	1,947
No	319	780	1,099
Total	1,338	1,708

a. What is the probability that a randomly selected respondent plans to increase use of social media?

(Round to three decimal places as needed.)

b. What is the probability that a randomly selected respondent is a B2C marketer?

(Round to three decimal places as needed.)

c. What is the probability that a randomly selected respondent plans to increase use of social media or is a B2C marketer?

d. Explain the difference in the results in(b) and(c).

A.

The probability in part(b) is a jointprobability, while the event in part(c) is a simple probability.

B.

The two events in part(c) are collectivelyexhaustive, while the event in part(b) is not.

C.

The probability in part(b) is a marginalprobability, while in part(c), the probability of an event or second event is calculated.

D.

The two events in part(c) are mutuallyexclusive, but part(b) has only one event.