need help in calculating the average time squared. Trial 1 = 1.20 s Trial 2 = 1.22 s Trial 3 = 1.32 s  all for distance 0.3 m I have the average time for that (1.20 + 1.22 + 1.32)/3 I would like to understand how to calculate the square of the average time so I can continue

An Introduction to Physical Science
14th Edition
ISBN:9781305079137
Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Chapter2: Motion
Section: Chapter Questions
Problem 7E: A student drives the 100-mi trip back to campus after spring break and travels with an average speed...
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I need help in calculating the average time squared.

Trial 1 = 1.20 s Trial 2 = 1.22 s Trial 3 = 1.32 s  all for distance 0.3 m

I have the average time for that (1.20 + 1.22 + 1.32)/3

I would like to understand how to calculate the square of the average time so I can continue with the other distances that I have. 

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