Question

Tolong kerjakan + CARA

Answer 1

(x1+x2+...+x10)/10 = xo
x1 + x2 + x3 + ...+x10) = 10. xo

2+4+6 +...+ 20 = 110

1/2 x1+2 + 1/2x2 +4 + 1/2 x3 + 6 +....+1/2(x10+ 20)
1/2 (x1+x2 +...+x10) + 2 + 4 + 6 +...+20
1/2 (10 Xo) + 110 = 5 xo + 110

X sekarang = (5 xo + 110 )/(10) = 1/2 xo + 11

Answer 2

X₀ = (x₁ + x₂ + x₃ + x₄ + ... + x₁₀)/(10)

⇒ 10x₀ = x₁ + x₂ + x₃ + x₄ + ... + x₁₀

maka

(1/2)x₁ + 2 + (1/2)x₂ + 4 + (1/2)x₃ + 6 + ... + (1/2)x₁₀ + 20
= (1/2)(x₁ + x₂ + x₃ + ... + x₁₀) + (2 + 4 + 6 + ... + 20)
= (1/2)(10x₀) + (10/2)(2 + 20)
= 5x₀ + 5(22)
= 5x₀ + 110

Jadi, Rata-ratanya,

Rata-rata = (5x₀ + 110)/(10)
                = (5/10)x₀ + 110/10
                = (1/2)x₀ + 11


Jawab : C

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