(a) what was jill’s total score on all of the quizzes? (b) how many total quizzes did jill take? (c) what is the mean score for jill’s quizzes? show your work.

Part (a):
To get the total score, we will multiply each score by its number of quizzes and then sum the products.
This is done as follows:
total score = 0(1) + 1(0) + 2(3) + 3(4) + 4(4) + 5(1)
total score = 0 + 0 + 6 + 12 + 16 + 5
total score = 39

Part (b):
To get the number of quizzes she took, we will just add up the number of quizzes as follows:
number of quizzes = 1 + 3 + 4 + 4 + 1
number of quizzes = 13 quizzes

Part (c):
To get the mean (average) score, we will divide the total score by the number of quizzes.
This is done as follows:
mean score = 

Hope this helps :)