You want to make a statement about the variability in the co

You want to make a statement about the variability in the costs of personnel shelters. After collecting sample data (cost in $K) on 9 shelters you perform some preliminary calculations Xbar = $47.25K, Summation of (XI - Xbar)2 =555.50

Solution

The variability is = Summation of (Xi - Xbar)^2 / number of observations = 555.5/9 = 61.7667

if in the case of sample , the variability is = Summation of (Xi - Xbar)^2 / number of observations-1 = 555.5/(9-1) = 69.4875