The table below shows the soft drinks preferences of people in three age groups. if one of the 255 subjects is randomly selected, find the probability that the person is over 40 given that he or she is a root beer drinker.

the complete question in the attached figure

person is over > total 85p(over 40) = 85/255 = 1/3=0.> 33.33%the answer is 0.33 (33%)

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.