a)
[tex] \frac{5 \times 10 + 3 \times 14 \ +4 \times 15 + 8 \times 16 }{20} [/tex]
=
[tex] \frac{50 + 42 + 60 + 128}{20} [/tex]
[tex] \frac{280}{20} = 14 [/tex]
Odp:14
b) diagram d
