A survey of senior citizens at a doctor's office shows that 45% take blood pressure-lowering medication,41% take cholesterol-lowering medication,and 14% take both medications.What is the probability that a senior citizen takes either blood pressure-lowering or cholesterol-lowering medication?
A)0.18
B)0.72
C)0
D)1
E)0.86

Question

Quizplus · Accepted Answer

To find the probability that a senior citizen takes either blood pressure-lowering or cholesterol-lowering medication, we can use the formula: 
P(BP or chol) = P(BP) + P(chol) - P(BP and chol) 
= 0.45 + 0.41 - 0.14 
= 0.72 
Therefore, the probability that a senior citizen takes either blood pressure-lowering or cholesterol-lowering medication is 0.72, which corresponds to choice B.

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