Question: Please show all work and don't use excel functions to solve. 1. For certain personal tax returns, the IRS will compute the amount to refund

Please show all work and don't use excel functions to solve.

1. For certain personal tax returns, the IRS will compute the amount to refund a taxpayer. Suppose the Chicago office of the IRS processes an average of three returns per hour that require a refund calculation.

a. What probability distribution applies to this situation?

b. What is the probability that the IRS processes exactly three refunds in a particular hour that requires a refund calculation?

c. What is the probability the IRS does not compute a refund on any return in an hour?

d. What is the probability the IRS processes at least one return in a particular hour that requires a refund calculation?

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