Math CentralQuandaries & Queries


Hi I am having a hard time figuring this out.

There are 21 students in the class. 1 made a grade of 100, 2 made grades of 90 , 3 made 80,
4 made 70, 5 made 60, 6 made 50.
What percentage made a grade below 70?

I know 11 students made below a 70.

Please help me find the percentage,


Hi Dee,

Three students received a grade of 90 or more. The proportion of students who scored 90 or more was
3/21 = 0.1429. If you wish to express this as a percentage multiply by 100 to get 14.29%.

I hope this helps,

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