Question

Find the mean, variance and standard deviation of the following measures: 2,5,6,3,9,10,12, and 15

Answer 1

$\mu=\frac{1}{8}\Sigma_{i=1}^8x_i=\frac{62}{8}=7.75.$

$\sigma^2=\frac{1}{8}\Sigma_{i=1}^8(x_i-\mu)^2=\frac{143.5}{8}=17.9375.$

$\sigma=\sqrt{17.9375}\approx 4.2353.$