20.将8.5,8.0,8.3,6.0,8.2,8.0,9.0按去掉一个最高分和一个最低分计算平均分是( )
0 278795 278803 278809 278813 278819 278821 278825 278831 278833 278839 278845 278849 278851 278855 278861 278863 278869 278873 278875 278879 278881 278885 278887 278889 278890 278891 278893 278894 278895 278897 278899 278903 278905 278909 278911 278915 278921 278923 278929 278933 278935 278939 278945 278951 278953 278959 278963 278965 278971 278975 278981 278989 366461
| A. | 8.0 | B. | 8.2 | C. | 8.3 | D. | 8.5 |