Hello I need help with standard deviation.I know that the formula is summation of frequency = (x - x) 2 over summation of frequency. BUT how do I figure out x-x(with the like over it)Thank you!

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.3: Using Data Displays
Problem 14E
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Hello I need help with standard deviation.

I know that the formula is summation of frequency = (x - x) 2 over summation of frequency. BUT how do I figure out x-x(with the like over it)
Thank you!

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