Question

On a test, the marks for ten students are: 2 students, 85%; 4 students, 78%; 3

Answer 1

Answer:

77.2%

Step-by-step explanation:

The average formula is:

$Average = \frac{Sum/of/all/numbers}{How/many/numbers/there/are}$

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:

$Average = \frac{772}{10} \\= 77.2$

Therefore, the average mark on the test was 77.2%

Hope this helps!!

- Kay :)