3. Suppose that, on average, 1 person in 1000 makes a numerical error in preparing his or her income tax return. If 10,000 forms are selected at random and examined, find the probability that 6, 7, or 8 of the forms contain an error. Find the mean and variance of the random variable X representing the number of persons among 10,000 who make an error in preparing their income tax returns.
3. Suppose that, on average, 1 person in 1000 makes a numerical error in preparing his or her income tax return. If 10,000 forms are selected at random and examined, find the probability that 6, 7, or 8 of the forms contain an error. Find the mean and variance of the random variable X representing the number of persons among 10,000 who make an error in preparing their income tax returns.
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 11ECP: A manufacturer has determined that a machine averages one faulty unit for every 500 it produces....
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Transcribed Image Text:3. Suppose that, on average, 1 person in 1000 makes a numerical error in preparing his or
her income tax return. If 10,000 forms are selected at random and examined, find the
probability that 6, 7, or 8 of the forms contain an error. Find the mean and variance of
the random variable X representing the number of persons among 10,000 who make an
error in preparing their income tax returns.
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