Mean, or average, is solved by adding all the numbers and dividing by the number of numbers. The answer is 88.
it's 7 it's 7 it's 7 it's 7 it's 7 it's 7it's 7 it's 7 it's 7it's 7 it's 7 it's 7
He should change the coefficient 5
First two are scalene last one is isosceles.