A company has 500 employees. In a random sample of 76 employees, 30 report that they have worked overtime at some point this month. Based on this sample, how many employees would you estimate to have worked overtime this month?

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?