a:(2,2),(2,3),(2,4),(3,2),(3,3),(3,4),(4,2),(4,3),(4,4)b:(2,2),xˉ=2(2,3),xˉ=2.5(2,4),xˉ=3(3,2),xˉ=2.5(3,3),xˉ=3(3,4),xˉ=3.5(4,2),xˉ=3(4,3),xˉ=3.5(4,4),xˉ=4c:μxˉ=92+2⋅2.5+3⋅3+2⋅3.5+4=3d:s=9(2−3)2+2⋅(2.5−3)2+3⋅(3−3)2+2⋅(3.5−3)2+(4−3)2=0.57735e:μ=32+3+4=3f:σ=3(2−3)2+(3−3)2+(4−3)2=0.816497g:s=2σ=0.57735
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