Omar recorded the number of hours he worked each week for a year. Below is a random sample that he took from his data.

13, 17, 9, 21

What is the standard deviation for the data?

Standard deviation: s = StartRoot StartFraction (x 1 minus x overbar) squared + (x 2 minus x overbar) squared + ellipsis + (x n minus x overbar) squared Over n minus 1 EndFraction EndRoot.

A.) 0
B.) 4
C) 2
D.) 26.7