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f 2 4 6 8 ---> 20
------------------------------
U.f 10 24 42 64 ---> 140
rata² = 140/20
= 7
s = 2 I5-7I + 4 I6-7I + 6 I7-7I + 8 I8-7I
= 2. 2 + 4. 1 + 6.0 + 8.1
= 4+ 4+ 8
= 16
SR = s/f
= 16/20
= 4/5
= 0,8
5) kelas modus : 30-34
TbMo = 30-0,5 = 29,5
c = 35-30 = 5
d₁ = 11-7 = 4
d₂ = 11-10 = 1
Mo = Tb Mo + (d₁/ d₁+d₂). c
= 29,5 + (4/ 1+4). 5
= 29,5 + 4
= 33,5
4) 13, 16, 18 , 19, 20, 22
f = 6
rata² = 108/6
x = 18
s = (13-18)² + (16-18)²+(19-18)²+(20-18)²+(22-18)²
= 25 + 4 + 1 + 4 + 16
= 50
SR = √s/f
= √50/6
= √25/3
varian = SR²
= 25/3