Question

The table below shows the results of a survey in which 100 people were asked how often they watched the news. Group A consisted of people who were registered voters, and Group B consisted of people who were not registered to vote. If one person is randomly chosen from among those who watch the news fewer then three times a week, what is the probability that the person was a member of Group A?

A. 21/38

B. 4/50

C. 21/50

D. 38/100

Answer 1

You 1st need to find out how many people only watch the news less than 3x per week. Those numbers are 11 + 27 = 38

2nd find out how many in group A watch the news less than 3x per week 7 + 14 = 21.

Now P(A|< 3x) =
`(21)/(38)` or A