Answer:
average is 88.39%
Explanation:
75.14 + 89.5 + 91.18 + 90.28 + 84.22 + 100 = 530.32
now divided 530.32 by 6 since there is 6 grades, dont count the no grade ones.
530.32/6 = 88.39 this is roudned to nearest tenth.
to solve for average, add up everything then divided by the number of things you have