Asmall independent organic food store offers a variety of specialty coffees. to determine whether price has ab impact on sales the mangers kept track of how many pounds of each variety of coffee were sold last month. based on the summary statistics shown below what percent of the variability in the number of pounds of coffee sold per week can be explained by price

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?