All you have to do to calculate the mean average is add the values of the numbers together and then divide that sum by the number of numbers :D.
So in this case:
766 + 878 = 1644
1644 / 2 = 822
The average of these two numbers is 822.
I'm thinking 75% because the increase from 4 to 7 is 2
K I think that it is okay because it would be 10
Answer:
8× 12= 96 hope it helps!!