Typeerror:'float' object is not callable problem solution

First of all, this is not a particularly difficult problem. There may be three reasons for the problem:

1. Syntax error caused by sloppy coding! Spelling error in function/method call! :
This situation is at least 80% possible! At least 80% possible! At least 80% possible!
Say the important thing three times!

2. The function name is consistent with the variable name. Such as mean = mean(***)

3. The operation symbol is missing. If a = bc should be changed to a = b*c