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討論串[計量] pp2-DS-86
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Let B1=no of biys with brown hair. B2=no of boys with other hair. G1=no of girls with brown hair. G2=no of girls with other hair. ask if (b1+g1)/(b1+b
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86. 7962-!-item-!-187;#058&005867. Do more than 50 percent of the children in a certain group have brown hair?. (1) 70 percent of the boys in the grou
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