Given the data:
11, 19, 13, 6, 5, 18
We are asked to find standard deviation.
First we will have to get the mean.
The Sum total:
= 11 + 19 + 13 + 6 + 5 + 18 = 72
Mean = Sum of items
Number of Items
Sum of iteams = 72
Number of items = 6
Mean = 72/6
Mean = 24
Let's get the standard deviation
Sum of squares = Σ(x1 - bar x)²
= (11 - 24)² + (19 - 24)² + (13 - 24)² + (6 - 24)² + (5 - 24)² + (18 - 24)²
σ = √ Σ(x1 - bar x)²/n - 1
σ =