in a small city 38 of adults have high blood pressure or hig

in a small city, 38% of adults have high blood pressure or high cholesterol. 25% of the adults have high blood pressure and 20% have high cholesterol. find the probability that a randomly chosen adult will have both high blood pressure and high cholesterol.

Solution

P(A and B) = P(A) + P(B) - P(A or B) = 0.25 + 0.2 - 0.38 = 0.07