3. A survey by Social Media Examiner reported that 76% of B2B marketers (marketers that focus primarily on attracting businesses) plan to increase their use of LinkedIn, as compared to 52% of B2C marketers (marketers that primarily target consumers). The survey was based on 1,780 B2B marketers and 3,306 B2C marketers. The following table summarizes the results:

a. Provide an example for a simple event.
b. Provide an example for a joint event.
c. What is the complement of a marketer who plans to increase the use of LinkedIn?
d. Why does a marketer plans to increase the use of LinkedIn and also check whether is a B2C marketer a joint event?
e. If a marketer is selected at random, what is the probability that
i. he or she plans to increase the use of LinkedIn?
ii. he or she is a B2C marketer?
iii. he or she plans to increase the use of LinkedIn or is a B2C marketer?
iv. Explain the difference in the results obtained in (ii) and (iii).

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BUSINESS FOCUS INCREASE USE OF LINKEDIN? B2B B2C Total Yes 1,353 1,719 3,072 No 427 1,587 2,014 Total 1,780 3,306 5,086 Source: Data extracted from "2016 Social Media Marketing Industry Report," socialmediaexaminer.com. BUSINESS FOCUS INCREASE USE OF LINKEDIN? B2B B2C Total Yes 1,353 1,719 3,072 No 427 1,587 2,014 Total 1,780 3,306 5,086 Source: Data extracted from "2016 Social Media Marketing Industry Report," socialmediaexaminer.com.