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Four short words sum up what has lifted most successful individuals above the crowd: a little bit more.-author-date统计学课后答案第四章统计学课后答案第四章4.1解:(1) p(2=x=5)=p(X=2)+p(X=3)+p(X=4)+p(X=5) =0.209+0.223+0.178+0.114 =0.724(2) p(x2)=p(X=0)+p(X=1) =0.041+0.130 =0.171(3) p(5x)=p(X=6)+p(X=7)+p(X=8)+p(X=9)+p(X=10) =0.061+0.028+0.011+0.004+0.001 =0.1054.2解:P(x=2)=BINOMDIST(2,4,0.5,0)=0.375P(x1.33)=1-P(Z1.33)=1-0.90824=0.091764.4解:使用SPSS得到的正态概率图如图所示观察到图中各点都围绕在一条直线周围,所以汽车的耗油量近似服从正态分布。-