no 7 dijawab yaa ,pakai caraa ,terimakasih ,besok mau dikumpul :)

jawab

xi = 7, 5, 4, 6, 8
n = 5
jumah data = 30
rataan X = 30/5 = 6

S² = (7-6)²+ (5-5)² +(4-6)² +(6-6)² +(8-6)²
S²= 1 + 0 + 4+0+ 4
S²= 9

simpangan baku = s= √s²
S = √9
S = 3