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Solve {5, 10, 15, 20} 的平均數 — x = 12.5

Method: 算術平均數. Verified step-by-step solution with our free AI math solver.
Problem

xˉ, {5,10,15,20}\bar{x},\ \{5, 10, 15, 20\}

Step-by-step solution

  1. 總和：5+10+15+20=505 + 10 + 15 + 20 = 50。

  2. 個數：n=4n = 4。

  3. 平均數：xˉ=50/4=12.5\bar{x} = 50 / 4 = 12.5。

Answer

xˉ=12.5\bar{x} = 12.5

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