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An IRS auditor randomly selects 3 tax returns from 58 returns of which 8 contain errors. What is the probability that she selec...Asked by Jodi
An IRS auditor randomly selects 3 tax returns from 55 returns of which six contain errors. What is the probability that she selects none of those containing errors?
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Answered by
MathMate
Initially, 49 out of 55 returns do not contain errors.
So probability of selecting the first (first trial) correct return is 49/55.
After this, there are 48 correct returns out of 54, so....48/54
For all three trials to succeed, we multiply the probabilities of all three trials to get the required probability.
So probability of selecting the first (first trial) correct return is 49/55.
After this, there are 48 correct returns out of 54, so....48/54
For all three trials to succeed, we multiply the probabilities of all three trials to get the required probability.
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