The great pyramid of giza is a square pyramid located by el giza, egypt. it is believed that the original height of the pyramid was 480.6 feet. the base is a square with side length of 755.9 feet. find the volume of the original great pyramid of giza. explain your reasoning.

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?