Question

Find the range and the variance (correct to one decimal place). 78,91,93,93,99

Answer 1

range=max-min=99-78=21

sample mean=(78+91+93+93+99)/5=90.8
(78-90.8)^2=163.84
(91-90.8)^2=0.04
(93-90.8)^2=4.84
(99-90.8)^2=67.24
sample variance=(163.84+0.04+4.84+4.84+67.24)/4=60.2