一班:
24+25+8
24+25+8+3 ×100%
=
57
60 ×100%
=0.95×100%
=95%;
二班:
18+20+5
18+20+5+2 ×100%
=
43
45 ×100%
≈0.956×100%
=95.6%;
答:一班的合格率是95%.二班的合格率是95.6%.
故选B.
一班:
24+25+8
24+25+8+3 ×100%
=
57
60 ×100%
=0.95×100%
=95%;
二班:
18+20+5
18+20+5+2 ×100%
=
43
45 ×100%
≈0.956×100%
=95.6%;
答:一班的合格率是95%.二班的合格率是95.6%.
故选B.