Question

Find the standard deviation from the following observations:
15,18,13,20,17,10,16,19,22,20.

Answer 1

Here `n=10`
Let assumed mean `a=16`
Standard deviation `sigma=sqrt((sumd_(i)^(2))/n-((sumd_(i))/n)^(2))`
`=sqrt(128/10-(10/10)^(2))`
`sigma=sqrt(12.8-1)`
`=sqrt(11.8)=3.42`