tolong di jawab nomor 2 yng benar yah...

(40x3) + (46x2) + (52x1) + ( 58 x1) + ( 65x2)
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3+2+2+1+2
(120) + (92)+(52) + (58) + (130)
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10
400
________
10 = 40
Jadi, rata rata panjang kalung 40

Rata - rata :
= (40 x 3) + (46 x 2) + (52 x 2) + 58 + (65 x 2) / 3+2+2+1+2

= 120 + 92 + 104 + 58 + 130 / 10
= 504 : 10
= 50,4

jadi rata ratanya 50,4