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Verified answer
Jawab(x1 + x2 + x3 +...+x10)/10 = 6
(x1 + x2 + x3 +...+x10) = 60
(x1+3)+(x2+5) +(x3 + 7) + ...+(x10+ 21) =
= (x1 + x2 + x3 +...+x10) + (3+5+ 7 +...+ 21)
= 60 + 120
= 180
rata sekarang =180/6 = 30