Tentukan kuartil dari data ukuran sepatu berikut:30,31,31,32,33,34,35,36,37.!

Q1 = 31+31/2 = 62/2 = 31
Q2 = median = 33
Q3 = 35+36/2 = 71/2 = 35,5
Qr = 35,5 -31 = 4,5
Qd = 1/2(Qr) = 4,5 / 2 = 2,25