Tolong dijawab pake caranya ya

Tolong dijawab pake caranya ya

Mean
$frac{12 times 30 + 20 times 35 +25 times 40 + 15 times 45 + 15 times 50 + 13 times 55}{12 + 20 + 25 + 15 + 15 + 13} = frac{4200}{100} = 42$
median (average data ke 50 dan 51)
$37.5 + 5 times 18 div 25 = 41.1 \ 37.5 + 5 times 19 div 25 = 41.3 \ \ frac{41.1 + 41.3}{2} = 41.2$