Question $1$: The following road sections are needed to be checked if some of them are nominated as 'potential black spots' that should be investigated in details.

The values given are the total three years accidents on these road sections.

Calculate the norm $($average$)$ of this accidents totals set.

Calculate the standart deviation of the data set and mention$/$decide which sections $($referring to their accident totals$)$ can be nominated as potential block spot. $($Show all necassary calculations$)$

Data: $20$ road sections, the followings are three years accident totals:

$5,4,7,8,2,0,11,8,7,6,0,1,2,5,12,6,6,3,10,3$