Question

How to find the range, variance, and standard deviation of these numbers; 2,489; 48,430; 51,840; 53,179; 65,755; 268,581?

Answer 1

Range: highest number-lowest number:
R=268,581-2,489=266,092
Variance( `sigma^2`) : for this you need to calculate the average. `bar x=`81,72

`sigma^2=((x_1-bar x)^2+...(x_n-bar x)^2)/N` , where N is the number of data you have.
The standard deviation ( `sigma`) is the square root of the variance.