In the fiscal year 2007 the irs audited 1.77 of individual, Ask an Expert

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In the fiscal year 2007, the IRS audited 1.77% of individual tax returns with income of $100,000 or more. If the percentage stays the same this year:
a) Would it be unusual for a return with income of $100,000 or more to be audited?
b) What is the probability that two randomly selected returns with income of $100,000 or more will be audited?
c) What is the probability that two randomly selected returns with income of $100,000 or more will not be audited?
d) What is the probability that at least one of the two randomly selected returns with income of $100,000 or more will be audited?

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