Question 1082870
Add them (6.3)
divide by the number of them (4)=1.575. That is the mean
variance is the sum of the squared deviations divided by the number of them  minus 1 (3)
.275^2+.075^2+.125^2+.225^2=0.1475
Divide by 3=0.04917. That is the variance
Take the sqrt=0.2217, which is the sd
Calculators will give the sd and that can be squared to get the variance.