A survey of senior citizens at a doctor's office shows that 40% take blood pressure-lowering medication, 47% take cholesterol-lowering medication, and 13% take both medications.
What is the probability that a senior citizen takes either blood pressure-lowering or cholesterol-lowering medication?
A)1
B)0.6
C)0.74
D)0.87
E)0

Question

Quizplus · Accepted Answer

To find the probability that a senior citizen takes either blood pressure-lowering or cholesterol-lowering medication, we use the formula for the union of two sets: P(A or B) = P(A) + P(B) - P(A and B). Here, P(A) = 0.40, P(B) = 0.47, and P(A and B) = 0.13. Thus, P(A or B) = 0.40 + 0.47 - 0.13 = 0.74.

A Survey of Senior Citizens at a Doctor's Office Shows