3. An internal Revenue Service inspector is to select 3 corporations from a list of 15 for tax audit purposes. Of the 15 corporations, 6 earned prots and 9 incurred losses during the year for which the tax returns are to be audited. If the IRS inspector decides to select 3 corporations randomly, then a) Write down the appropriate probability distribution with its parameters. b) What is the probability that the number of corporations in these 3 that incurred losses during the year for which the tax returns are to be audited is at least 2? c) calculate are the mean and variance of this distribution