Sean is at the top of a light tower 800 ft above the sea level. he sees a boat in the distance and measures the angle of depression to be 3.5degrees. one hour later the angle of depression is 5.2degrees. how far did the boat travel in the hour?

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?