rEsults on
A、history tEst

ClAss	numBEr oF stuDEnts tAking tEst	AvErAgE* sCorE
x	54	70
y	41	73
z	32	76

*ArithmEtiC mEAnthE AvErAgE(ArithmEtiC mEAn)sCorE For AlloF thE stuDEnts in thE 3 ClAssEs is
A、lEss thAn 70
B、BEtwEEn 70 AnD 73
C、ExACtly 73
D、BEtwEEn 73 AnD 76
E、grEAtEr thAn 76