statistics · worked example

Solve {1, 2, 3, 4, 5} 的標準差 = = √2 ≈ 1.414

Method: 母體標準差. 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. 計算平均數:xˉ=1+2+3+4+55=3\bar{x} = \frac{1+2+3+4+5}{5} = 3

  2. 與平均數的偏差:2,1,0,1,2-2, -1, 0, 1, 2

  3. 偏差的平方:4,1,0,1,44, 1, 0, 1, 4。總和 = 1010

  4. 母體變異數:σ2=105=2\sigma^2 = \frac{10}{5} = 2

  5. 標準差:σ=21.414\sigma = \sqrt{2} \approx 1.414

Answer

σ=21.414\sigma = \sqrt{2} \approx 1.414

Want to solve a different problem? Open the standard-deviation solver →