rata-ratanya berapa?

[tex]x = \frac{24 + 28 + 24 + 27 + 20}{4 + 4 + 3 + 3 + 2 } \\ x = \frac{123}{16} \\ x = 7.68[/tex]
maaf kalau salah

(6x4) + (7x4) + (8x3) + (9x3) +(10x2)
=(24+28+24+27+28): (4+4+3+3+2)
=123 : 16
=7,68
=7,7