question 82 Functions · easy

The average rating is always the first rating

average_rating should return the mean of a film's ratings as a float, so [4, 5, 3, 5] gives 4.25, and None when there are no ratings. Instead it returns the first rating, and a film with no ratings crashes it. Find and fix every bug.

Functionaverage_rating(ratings)

ratingsa list of whole-number ratings from 1 to 5

Returnsthe mean as a float (4.0, not 4), or None for an empty list

Examples

callaverage_rating([4, 5, 3, 5])returns4.25

callaverage_rating([2, 4])returns3.0

callaverage_rating([])returnsNone