Answer:
Three
Step-by-step explanation:
Assuming the grade score from 70 to 100 is A; for grade score from 60 to 69 is B and grade score from 50 to 59 is C. Well it is certain there are three peaks in the distribution of scores
9280
8000 x .16 + 8000
your answer would be
Hope this helps! (:
331
Add 74 + 46 + 57 = 177
Add 9 + 36 = 45
Add 45 + 46 = 91