有人能帮我解决这数学问题吗？

kenchuan

the mean mark for a group of students taking a statistics test is 70.6.The mean marks for male and female students is 68.5 and 72.0 respectively.Find the ratio of the number of male and female students.

idontwant2b

答案是2/3 吗？
我的working


符号自己决定，我这样做是比较容易看而已。
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[ 本帖最后由 idontwant2b 于 26-11-2009 02:24 PM 编辑 ]

kenchuan

谢谢你。。答案对了。。