A group of volunteers for a clinical trial consists of 79 women and 77 men.20 of the women and 18 of the men have high blood pressure.If one of the volunteers is selected at random find the probability that the person is a man given that they have high blood pressure.

A) 0.494
B) 0.474
C) 0.234
D) 0.244
E) 0.115

We are asked to find the probability of a randomly selected volunteer being a man, given that they have high blood pressure. This is a conditional probability question with the event "man with high blood pressure" in the numerator and "high blood pressure" in the denominator.
Let M = the event of selecting a man and H = the event of high blood pressure. Using the formula for conditional probability, we have:
P(M|H) = P(M and H) / P(H)
P(M and H) = 18 (number of men with high blood pressure)
P(H) = 20 + 18 = 38 (total number of high blood pressure cases)
Therefore, P(M|H) = 18/38 = 0.474.
So, the best choice is B.