A survey about social media reported that 77% of B2B marketers(marketers that focus primarily on attractingbusinesses) plan to increase their use of socialmedia, as compared to 55% of B2C marketers(marketers that primarily targetconsumers). The survey was based on 1,279 B2B marketers and 1,729 B2C marketers. The accompanying table summarizes the results. Complete parts(a) through(d) below.

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

nothing

(Round to three decimal places asneeded.)

b. What is the probability that a randomly selected respondent is a B2Cmarketer?

nothing

(Round to three decimal places asneeded.)

c. What is the probability that a randomly selected respondent plans to increase use of social media or is a B2Cmarketer?

nothing

(Round to three decimal places asneeded.)

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.

X Contingency Table Increase Use of Business Focus Social Media? B2B B2C Total Yes 984 947 1,931 No 295 782 1,077 Total 1,279 1,729 3,008 Print Done