a)
10 - 3 = 7
b)
32 elevi .....100%
26 elevi .........x%
x = 26×100%/32 = 81,25%
c)
Ma = (3 + 4 + 10 + 12 + 56 + 64 + 45 + 50)/32 = 244/32 = 7,625