Which formula is used to calculate the standard deviation of sample data?
H
-
1
2 (x1 - x)2+(x2-x)2 +...+(XN-6) 2
N
16--, (**)*(8=)*.- (89w=
X1-X
+
X2-X
+...+
X
-X
n-1

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.