a. Sample mean(x̅) (simply the arithmetic average of the sample values)
x̅ = (21+33+16+29+32)/5 = 26.2
b. Sample variance (s² ) (The average of the squared differences from the Mean)
s² = [ (21-26.2)² + (33-26.2)² + (16-26.2)² + (29-26.2)² + (32-26.2)² ]/(5-1)
= [ (-5.2)² + (6.8)² + (-10.2)² + (2.8)² + (5.8)² ]/4
= [ 27.04+46.24+104.04+7.84+33.64]/4
= 218.8/4
= 54.7
c. Sample standard deviation (s) (Square root of sample variance)
s = 54.7^0.5 = 7.396 ≈ 7.4