數學問題集(19)---平均數的問題

2010-08-31 10:28 pm
有甲、乙、丙、丁、戊、己、庚、辛、壬、癸十個數,現在設比甲小82.04%的數為a,比乙小78.98%的數為b,比丙小80.16%的數為c,比丁小76.58%的數為d,比戊小81.86%的數為e,比己小79.08%的數為f,比庚小73.52%的數為g,比辛小78.26%%的數為h,比壬小80.62%的數為i,比癸小79.74%的數為j,則a, b, c, d, e, f, g, h, i, j的平均數為A;另再設比甲小19.18%的數為k,比乙小5.41%的數為l,比丙小20.64%的數為m,比丁大5.39%的數為n,比戊小18.37%的數為o,比己小5.86%的數為p,比庚大19.16%的數為q,比辛小2.17%的數為r,比壬小12.79%的數為s,比癸小8.83%的數為t,則k, l , m , n, o, p, q, r, s, t的平均數為B,求A/B的值。

回答 (1)

2010-08-31 10:32 pm
✔ 最佳答案
A/B = ( a + b + c + d + e + f + g + h + i + j ) / ( k + l + m + n + o + p + r + s )

a / k = ( 1 - 82.04 % ) / ( 1 - 19.18% ) = 2 / 9

b / l = 2 / 9

c / m = 2 / 9

...

h / p = 2 / 9

i / r = 2 / 9

j / s = 2 / 9

so ,

( a + b + c + d + e + f + g + h + i + j ) / ( k + l + m + n + o + p + r + s )

= 2 / 9

Answer : 求A/B的值 : 2 / 9


2010-08-31 14:33:54 補充:
I am sorry is :

( a + b + c + d + e + f + g + h + i + j ) / ( k + l + m + n + o + p + q + r + s )

2010-08-31 14:35:01 補充:
A/B = [ ( a + b + c + d + e + f + g + h + i + j ) x 10 ] / [ ( k + l + m + n + o + p + q + r + s ) x 10 ]

= A/B = ( a + b + c + d + e + f + g + h + i + j ) / ( k + l + m + n + o + p + q + r + s )
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