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
吾識計maths (04會考MC)....請列出計算步驟...吾該~~~~~~
2008-05-05 12:55 am
回答 (4)
2008-05-05 1:21 am
✔ 最佳答案
mean weight= sum of weight/no. of peopletotal 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
參考: myself.
2008-05-05 1:12 am
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
=]
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
=]
參考: ME
2008-05-05 1:03 am
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?
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?
收錄日期: 2021-04-24 10:58:34
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