nilai Simpang kuartil dari data 4,4,5,5,6,7,7,8,8 adalah

Q1 =x1/4. (n+1)
= x1/4. 10
=x2,5
=4,5

Q2 = x1/2. (n+1)
= x1/2. 10
=x5
=6

Q3 = x3/4. (n+1)
=x3/4. 10
=x7,5
=7,5

Qd= 1/2 (Q3-Q1)
=1/2 (7,5-4,5)
=1/2 (3)
=1,5