Math question below the cut

69.5

Step-by-step explanation:

A trapezoid's area is

.

We know base 1 and base 2.

115+105=220.

220/2=110.

110*h=7645

7645/110=h

h=69.5

Ryan is correct, the mean is about 8.1.

To find the mean, you have to add up all the values, then divide by the total amount.

For Sample A:
60 x 6 + 90 x 7 + 145 x 8 + 150 x 9 + 55 x 10 = 4050

If you add up all the adults, you have 500.

Dividing 4050 by 500 = 8.1

Sample B will produce a very similar result.