• In a group of 40 people, 10 are healthy and every person the of the remaining 30 has either high blood pressure, a high level of cholesterol or both. If 15 have high blood pressure and 25 have high level of cholesterol,
    a) how many people have high blood pressure and a high level of cholesterol?
    If a person is selected randomly from this group, what is the probability that he/she
    b) has high blood pressure (event A)?
    c) has high level of cholesterol(event B)?
    d) has high blood pressure and high level of cholesterol (event A and B)?
    e) has either high blood pressure or high level of cholesterol (event A or B)?
    f) Use the above to check the probability formula: P(A or B) = P(A) + P(B) – P(A and B).

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