Evaluate each of the following and write the answer to the ap- propriate number of significant figures. a. 212.2 26.7 402.09 b. 1.0028 0.221 0.10337 c. 52.331 26.01 0.9981 d. 2.01 102 3.014 103 e. 7.255 6.8350

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?