Question

The red blood cell counts (in cells per microliter) of a healthy adult measured on days are as follows: 54, 55, 53, 50, 48 Find the standard deviation of this sample of counts. Round your answer to two decimal places.

Answer 1

Solution :

n = 5

= = (54 + 55 + 53 + 50 + 48) / 5 = 260/5 = 52

s =  (x - )² / n - 1  

= [(54 - 52)² + (54 - 52)² + (54 - 52)² + (54 - 52)² + (54 - 52)² / (5 - 1)]

= 34 / 4

standard deviation of this sample = 2.92