Question

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)

Answer 1

77.2%

Explanation:

The average formula is:

`Average = (Sum/of/all/numbers)/(How/many/numbers/there/are)`

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:

`Average = (772)/(10) \\= 77.2`

Therefore, the average mark on the test was 77.2%

Hope this helps!!

- Kay :)