Question 1088168
{{{Standard- deviation = sqrt((Sum of squares/N)-(Mean^2))}}}

Here: 

Standard deviation= 2
Sum of squares= 3600
Total numbers=N=100
To find: Mean?

Putting values in formula:

{{{2 = sqrt((3600/100)-(Mean^2))}}}

Squaring both sides:

{{{4 = ((3600/100)-(Mean^2))}}}

Simplifying 

{{{4 = ((36)-(Mean^2))}}}


{{{Mean^2 = ((36)-(4))}}}


{{{Mean^2 = (32)}}}


{{{Mean = (sqrt(32))}}}


{{{Mean = (5.6568)}}}