(1)
4
14 ×100%≈28.6%;
答:优生率是28.6%;
(2)
3
14 ×100%≈21.4%;
答:不及格率为21.4%;
(3)(72+98+83+43+90+63+57+73+78+54+60+70+87+72)÷14,
=1000÷14,
≈71.4(分);
平均分为71.4分;
故答案为:28.6,21.4,71.4.
(1)
4
14 ×100%≈28.6%;
答:优生率是28.6%;
(2)
3
14 ×100%≈21.4%;
答:不及格率为21.4%;
(3)(72+98+83+43+90+63+57+73+78+54+60+70+87+72)÷14,
=1000÷14,
≈71.4(分);
平均分为71.4分;
故答案为:28.6,21.4,71.4.