標題:

吾識計maths (04會考MC)....請列出計算步驟...吾該~~~~~~

發問:

the mean weight of 36 boys and 32 girls is 46kg. If the mean weight of the boys is 52 kg, the the mean weight of the girls is A.39.25kg b.40kg C.40.67kg D.49kg

最佳解答:

mean weight= sum of weight/no. of people total mean W=46kg sum of whole class W/(36boys 32girl)=46kg sum of whole clas W=46kg(36 32)=3128kg mean weight of boys = sum of boys weight/no. of boys 52 kg= sum of boys weight/36boys sum of boys weight=1872 mean weight of girls=sum of girls weight/no. of girls mean weight of girls=sum of girls weight/32 Total weight of whole class=sum of girls weight sum of boys weight 3128kg=sum of girls weight 1872 sum of girls weight=1256kg So, mean weight of girls=1256/32=39.25kg

其他解答:

A total weight ______________ = mean weight number of people total weight __________ = 46kg 36+32 total weight = 3128 total weight of boys ________________ = 52 36 total weight of boys =1872 total weight of girls=3128-1872 =1256 1256 ____ 32 =39.25KG =]|||||The answer is A.39.25kg|||||THE TOTAL WEIGHT OF THEM=(36+32)x46kg=3128kg THE TOTAL WEIGHT OF BOYS=36x52kg=1872kg THE mean weight of the girls is(3128-1872)kg over32=39.25kg Is it really會考MC?

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