simpangan baku dari data 7, 10, 11, 4, 8, 6, 10, 8, 8, 8

7 + 10 + 11 + 4 + 8 + 6 + 10 + 8 + 8 + 8 / 10 = 80/10 = 8
(7-8)² + (10-8)² +(11-8)² +(4-8)² + (8-8)² + (6-8)² + (10-8)² + (8-8)² + (8-8)² + (8-8)² / 10
= 1 + 4 + 9 + 16 + 0 + 4 + 4 + 0 + 0 +0 / 10
= 38/10
simpangan baku = √38/10
(c)