A) Calculate an estimate for the mean height of the students.

b) Explain why your answer to part (a) is an estimate.

i need help in B cause ive got the answer for a. It is 129.3 but i need help in b pleasee!!

Suppose that a disk drive has 5,000 cylinders, numbered 0 to 4,999. the drive is currently serving a request at cylinder 2,150, and the previous request was at cylinder 1,805. the queue of pending requests, in fifo order, is: 2069, 1212, 2296, 2800, 544, 1618, 356, 1523, 4965, 3681