Question

The following information relates to a sample of size $60:\Sigma x^2=18000,\Sigma x=960$ The variance is

• A. 6.63
• B. 16
• C. 22
• D. 44

Answer 1

Answer: (D)

Variance $=\frac{\Sigma x_i^2}{n}-{\left(\frac{\Sigma x_i}{n}\right)}^2$
$=\frac{18000}{60}-{\left(\frac{960}{60}\right)}^2=300-256=44$