Question

What is the standard deviation for 54, 36, 30, 28, 27

Answer 1

11.18

Explanation:

Step 1: average : (54+36+30+28+27) / 5 = 35

Step 2: variance:

sum of the squares of (each number - average value) divided by (n-1)

[ (54-35)^2 + (36-35)^2 + (30-35)^2 + (28-35)^2 + (27-35)^2 ] / (5-1) = 125

Step 3: standard deviation = √(variance) = √125 = 5√5 (about 11.18)