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In a certain urban area the probability that a middle-age person has hypertension is 0.2. The...

In a certain urban area the probability that a middle-age person has hypertension is 0.2. The probability that a middle-age person has high cholestrol is 0.8. Assume that these two conditions are mutually independent. The probability that a randomly chosen middle-age person suffers from at least one of these two conditions is closest to:

A: 0.76

B: 0.91

C: 0.84

D: 0.79

E: 0.75

math   Statistics-And-Probability   
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Answer #1

probability that a randomly chosen middle-age person suffers from BOTH=0.8(0.2)=0.16

The probability that a randomly chosen middle-age person suffers from at least one of these two conditions is

0.8+0.2-0.16

=0.84

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