Well for the first part the area of the square is just 8 x 8 = 64

The area of a circle is so the area of a semi circle is just that divided by 2 which in this care is

So total area is 64 +

For the second part i would do the sum

and then divide this by the total number of students which is 56. So the answer is 0.776 to 3 decimal places