Re: [計量] In a class of 120 students, 60 ...
※ 引述《berrylover (看不見看不見我不要看見ꌩ》之銘言：
: ※ 引述《joannepu1110 (花花兒)》之銘言：
: : BB 第591頁
: : 26.In a class of 120 students, 60 percent can speak French and the rest can
: : speak only English. If 25 percent of those in the class who can speak French
: : can also speak English, how many of the students in the class can speak
: : English?
: : A:66
: 120*0.4+120*0.6*1/4 = 66
: : 還有第29題 但是圖不會畫 如果好心人會的話 麻煩直接跟我說如何算就好!!!
: : 30.The positive quantities X,Y and Z vaty over time, and 2x/3 always equals
: : 16yz. If y is tripled and z is halved, then x is
: : A:increased by 50%
: 2x/3=16yz
: 2x'/3=16y'z'=16(3y)(z/2)=24yz
: =>x'=3/2x
: : BB第619頁
: : 9.On a 50-question multiple-choice test, 3 points weregiven for each question
: : answered correctl and 1 point was deducted for each question answered
: : incorrectly. A student who answered all of questions on the test received a
: : total of 98 points.
: : A column
: : The number of questions on the test that the student answered
: : incorrectly
: : B column
: : 14
: 3(50-x)-x=98
: x=13
: : 還有第623頁的24題及25題
: : 24題我怎麼算都是(D) 1070000
: : 因為用41.7-17.4=24.3 再用4415000X0.243=.... 不是這樣算嗎
: : 還有25題的三個選項都看無
: : 麻煩好心人了 謝謝^^
: 我沒BB...@_@
24題很顯然大大忘了注意看題目…
difference between the number of females employed as "professionals" and
the number of females employed in "service/maintenance occupations" ?
題目裡"professionals" 只佔17.6%，而"service/maintenance occupations"只佔
17.9%，因此number difference = 4415000*(17.6%*41.7% - 17.4%*17.9%)
= 186516 選B
25題的三個選項:
I 是說男性在paraprofessional occupations只有不到1/3的比例
II 是說女性在technical occupations的人數比skilled craft occupations
的人數多5倍以上
III 是說女性在professional occupations的人數比official/administrative
occupations人數多6倍以上
仔細算算其實三個選項都對。 故選E
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