Nine friends decided to take a chalange during a week to see who can run the longest distance, every day they run as much as they can during a week (five working days) and each of them recorded how many kilometers they run per day

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Nine friends decided to take a chalange during a week to see who can run the longest distance, every day they run as much as they can during a week (five working days) and each of them recorded how many kilometers they run per day.

At the end of the week, they presented the total kilometers run during the week. The data is presented bellow:

15, 20, 12, 18, 15, 20, 25, 23, 21

What is the standard deviation of this sample data?

a.3.02

 b.5.20

 c.4.17

 d.4.25