Can you explain how to do this problem

Question

The following is a list of 11 measurements:

72, 28, 56, -47, -36, -41, 21, -31, -56, 41, -54 .

Suppose that these 11 measurements are respectively labeled x1, x2,...x11 . (Thus,72 is labeled x1 ,28 is labeled x2 and so on.)

Find 11 looks like a E under that is i=1 than xi over 29

Round your answer to at least two decimal places.