A drug test is accurate 97% of the time. If the test is given to 2300...
A drug test is accurate 97% of the time. If the test is given to 2300 people who have not taken drugs, what is the probability that at least 71 will test positive?
Homework Answers
By using normal approximation:
Mean = np = 2300*0.03 = 69
Standard deviation = 
= 8.1811
Hence,
P(Atleast 71)
= P(X > 70.5) [Continuity Correction]
= P(z > (70.5 - 69)/8.1811)
= P(z > 0.18)
= 0.4273
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A drug test is accurate 97% of the time. If the test is given to
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