Wrong mathematics calculations

ChatGPT Bugs
1

The image shows a table and calculations for finding E(X^2) and variance, using frequency (f) and squared values (X^2), with a highlighted total for um fX^2 = 399600. (Captioned by AI)
The image shows a table and calculations for finding E(X^2) and variance, using frequency (f) and squared values (X^2), with a highlighted total for um fX^2 = 399600. (Captioned by AI)1531×855 69.2 KB

I was doing my homework and I got wrong maths calculation