SOLUTION: 1. In a group of 60 people, 20 are healthy and the remaining 40 has either high blood pressure, a high level of cholesterol or both. If 30 have high blood pressure and 20 have high

Question 1102208: 1. In a group of 60 people, 20 are healthy and the remaining 40 has either high blood pressure, a high level of cholesterol or both. If 30 have high blood pressure and 20 have high level of cholesterol, when a person is selected randomly from this group, what is the probability that he/she
a) Has high level of cholesterol(event B)?

b) Has high blood pressure (event A)?

c) Has high blood pressure and high level of cholesterol (event A and B)?
d) Has either high blood pressure or high level of cholesterol (event A or B)?

Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
40 have HBP, HC, or both
30 have HBP+20 have HC=50, so 10 are double counted having both, and subtracted that makes 40.
a. High cholesterol is 20/60 or 1/3
b. High BP is 30/60 or 1/2
c. Both is 10/60 or 1/6
d. Either is 40/60 or 2/3

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