lower lim upper lim sample frequency

-3 -2 11

-2 -1 22

-1 0 19

0 1 14

1 2 21

2 3 13

Perform the goodness of fit test at the 10% significance level. Are the residuals normally distributed?

I have the formula as the sum of (((a-e)^2)/e)))

a=sample frequency

e=total number of residuals*area under pdf for that class

but how do I find area under probability distribution function for class width? Pleeeeeasee help