Personal Income Tax

According to the Internal Revenue Service, income tax returns one year averaged 1,332 in refunds for taxpayers. One explanation of this figure is that taxpayers would rather have the government keep back too much money during the year than to owe it money at the end of the year. Suppose the average amount of tax at the end of a year is a refund of 1,332, with a standard deviation of 725. Assume that amounts owed or due on tax returns are normally distributed. a. What proportion of tax returns