Question

In the data set below, what is the standard deviation? 4, 4, 8, 4, 5, 5

Answer 1

σ2 = Σ(xi - μ)2 / N

= (4 - 5)2 + ... + (5 - 5)2 / 6

= 12 / 6

= 2

σ = √2

= 1.4142135623731

/ = fraction

The answer is 1.4142135623731

(round up)