tolong ya nomor 9 sama 10 pake cara :)

9.d.13
10.a15

caranya gkak tau

10. (40.12)+(45.8)+(50.1)+(55.1)+(60.2)+(65.4)+(70.1)
------------------------------------------------------------------------------
12+8+1+1+2+4+1

=480+ 360 + 105 +120+260+70
-----------------------------------------------

29
= 48,1 → rata2 nilai
jadi yang nilainya di bawah rata rata

12+8=20