Buat UN Nomor 36 yaa

7,2 = 10+24+7x+48+27
------------------------
15+x
108 + 7,2x = 109 + 7x
7,2x - 7x = 109 - 108
0,2x = 1
x = 5

> Mean = 10+24+35+48+27
-------------------------
20
= 144 = 7,2
-----
20

> Yg di bawah rata2 = 2+4+5 = 11 anak (D)