Question

Nilai Varians ( Ragam ) dari data : 6, 7, 7, 8, 8, 8, 8, 12 adalah .......

A. 22
B. 11/4
C. 8
D. 13/4
E. 5/4

Answer 1

Cari rata rata dulu-->6+7+7+8+8+8+8+12/8=64/8=8
n=8
ragam= jml(x-rata rata)²/n
(6-8)²+2(7-8)²+4(8-8)²+(12-8)²/8
=-2²+2.1²+4.0²+4²/8
=4+2+0+16/8
=22/8
=11/4