The table below shows the soft drink preferences of people in three age groups.

  Cola Root Beer Lemon-Lime
Under 21 years of age 40 25 20
Between 21 and 40 35 20 30
Over 40 20 30 35

If one of the 255 subjects is randomly selected, find the probability that the person is over 40 years of age given that he/she drinks root beer.

A. 2/5

B. 5/17

C. 6/17

D. none of these

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1 Answer

The total root-beer drinkers is 25+20+30=75. Out of these, 30 are over 40 years old, so the probability is 30/75=⅖, answer A.

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