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statistics · worked example

Solve simpangan baku dari {1, 2, 3, 4, 5} = = √2 ≈ 1.414

Method: simpangan baku populasi. Verified step-by-step solution with our free AI math solver.
Problem

σ, {1,2,3,4,5}\sigma,\ \{1, 2, 3, 4, 5\}

Step-by-step solution

  1. Hitung rata-ratanya: xˉ=1+2+3+4+55=3\bar{x} = \frac{1+2+3+4+5}{5} = 3.

  2. Simpangan dari rata-rata: −2,−1,0,1,2-2, -1, 0, 1, 2.

  3. Kuadrat simpangan: 4,1,0,1,44, 1, 0, 1, 4. Jumlah = 1010.

  4. Variansi populasi: σ2=105=2\sigma^2 = \frac{10}{5} = 2.

  5. Simpangan baku: σ=2≈1.414\sigma = \sqrt{2} \approx 1.414.

Answer

σ=2≈1.414\sigma = \sqrt{2} \approx 1.414

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