Draco recently purchased a new surface book for $2300 the surface book will use 17.28 per year to run in electricity. Write an average cost function. What is the average yearly cost 20 they operate and operate this computer if he intends to use it for the next four years

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?