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A drug test is accurate 93% of the time. If the test is given to 215 people who have not taken drugs, what is the
A drug test is accurate 93% of the time. If the test is given to 215 people who have not taken drugs, what is the probability that exactly 197 will test negative?
First, use the normal approximation to the binomial, and use the continuity correction.
Normal Approximate Probability =
Now use the binomial distribution.
Exact Binomial Probability =
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