# What is the best approximation of the standard deviation of #{10,15,20,25,30}# - #5,7.5# or #10#?

##### 1 Answer

Sep 23, 2016

Standard deviation can be best approximated by

#### Explanation:

The mean of

The deviations from mean are

square of deviations are

average deviation is

and standard deviation is

Hence, standard deviation can be best approximated by