Question: in python Given a dictionary named grades, built with key:value pairs of student:score, calculate averageScore, the average of all scores. For example: if grades referred

in python Given a dictionary named grades, built with key:value pairs of in python

Given a dictionary named grades, built with key:value pairs of student:score, calculate averageScore, the average of all scores. For example: if grades referred to \{"David":50, "Justin":90, "Samuel": 91\}, then averageScore would refer to 77.0. In case grades happens to be empty, averageScore should ha ve a value of None. Additional Notes: grades should not be modified

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