Standard Deviation help needed


Hey guys :slight_smile: So I'm a bit stuck in this section. This is what I've got so far:

notes: I used grades_lst instead of scores the previous functions as you can tell above. It all works fine except for this last piece of code where I get this error: Oops, try again. grades_std_deviation(8.2222222222) raised an error: 'float' object is not iterable

edit: also I used grades_lst throughout the code but in the previous exercise the program converted it into 'grades' for the first three functions idk why.


I've also tried this:

but I get the following error: Oops, try again. grades_std_deviation(5.4375) returned 18.2776094147 instead of the expected: 2.3318447633


Nvm, I've managed to solve it.. finally


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