standar deviasi untuk data :7,11,13,9,15 adalah.. .

jawab
statistik
xi = 7, 11, 13, 9, 15
n = 5
∑xi = 55
X = 55/5 = 11

Standarad Deviasi = SD = √{∑|xi-X|² /(n) ]

SD = √[ (7-11)²+(11-11)²+(13-11)²+(9-11)²+(15-11)²] / (5)
SD = √[(16+0+4+9+16)/(5)= √(45/5) = √9
SD = 3