Mean, median and standard deviation calculator

Enter your values. The answer and the full worked solution update as you type.

Result

Mean14

Median14

Sample standard deviation3.742

Population standard deviation3.464

Range11

Step-by-step solution

Mean

x̄ = Σx/n = 98/7 = 14

Spread

Σ(x − x̄)² = 84

s = √(84/6) = 3.742

Median

sorted: 9, 11, 12, 14, 15, 17, 20

Key formulas

Mean: x̄ = Σx/n
Sample standard deviation: s = √(Σ(x − x̄)²/(n − 1))
Median: middle value of the sorted data

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