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11+2*14+2*15+2*17+3*18+19+29+30+2*35+2*38+39+2*40=
=11+28+30+34+54+19+29+30+70+76+39+80=500
500:20=25pkt-srednia arytmetyczna
b)
11,14,14,15,15,17,17,18,18,(18,19),29,30,35,35,38,38,39,40,40
(18+19):2=18,5-mediana
c)
A<18,5
chyba 18