Question

Find the standard deviation of the data, 12, 19, 9.

Answer 1

4.19

Explanation:

Find the mean:

`\text{Mean}=(12+19+9)/(3)=(40)/(3)`

Find the standard deviation:

`\text{Standard Deviation}=\sqrt{((12-(40)/(3))^2+(19-(40)/(3))^2+(9-(40)/(3))^2)/(3)}=\sqrt{(158)/(9)}\approx4.19`