tolong banget ya........

6 , x , 7 , y , z , 8 , 8 , 9
Karena Mo = 7 , Maka dipastikan nilai y dan z adalah 7

Mean = (6 + 7 + 7 + 7 + 8 + 8 + 9 + x) / 8
7,25 = (52 + x) / 8
58 = 52 + x
x = 6

Jadi datanya
6 , 6 , 7 , 7 , 7 , 8 , 8 , 9

Qi = i(n + 1)/4

Q₁ = 1(8 + 1)/4
Q₁ = 2 ¼

Q₁ = x₂ + ¼ (x₃ - x₂)
= 6 + ¼(7 - 6)
= 6 ¼
= 6,25

Q₃ = 3(9)/4
Q₃ = 6 ¾

Q₃ = x₆ + ¾ (x₇ - x₆)
= 8 + ¾(8 - 8)
= 8

Qr = Q₃ - Q₁
= 8 - 6,25
= 1,75

Qd = ½ (Q₃ - Q₁)
= ½ (1,75)
= 0,875