% Calculation Field

Hi!

Guys, I have a field that I use to calculate the amount of errors divided by the total amount of requests and get the percentage of errors.

By day this calculation is correct, but when I want to group this percentage by day of the week, it doesn't do it correctly. In the example below I would have for Sunday: 16/3553 = 0.45% and not 2.57% as shown. Could you help me, please?