On a test, the marks for ten students are: 2 students, 85%; 4 students, 78%; 3 students, 66%; and 1 student, 92%. What is the average mark on the test? (Exact
Answer)

77.2%

Step-by-step explanation:

The average formula is:

Let's first find the sum of all the numbers (remember sum means to add):

(2)(85) + (4)(78) + (3)(66) + 92 = ?

170 + 312 + 198 + 92 = 772

There are marks for 10 students so that is what goes at the bottom (10 students, 10 test scores)

Plug both things into the equation:

Therefore, the average mark on the test was 77.2%

Hope this helps!!

- Kay :)

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