GMAT考试数学辅导04年1月数学总结(三)
<p> 58.给出一个柱形图，横坐标是六至十二月的平均每日用电量。 纵坐标是千瓦。 每月头600度电每度$0。14，超过的每度$0。11。 求八月的<span word="cost">cost</span>.</p><p> 59.给出一个柱形图，横坐标是<span word="working">working</span> <span word="hours">hours</span>,纵坐标是人数。 求<span word="working">working</span> <span word="hours">hours</span> 的<span word="median">median</span>.</p><p> 60.<span word="DS">DS</span>, 不放回抽样，共有<span word="English">English</span> <span word="and">and</span> <span word="Spanish">Spanish</span> 良种，抽两本，问抽得<span word="at">at</span> <span word="least">least</span> <span word="one">one</span> <span word="english">english</span> <span word="book">book</span>的概率。</p><p> 1)<span word="english">english</span> 与<span word="spanish">spanish</span> 的比是1：3</p><p> 2)书的总数少于20本</p><p> 61.<span word="scientist">scientist</span> <span word="studies">studies</span> <span word="the">the</span> <span word="migration">migration</span> <span word="trend">trend</span> <span word="of">of</span> <span word="a">a</span> <span word="group">group</span> <span word="of">of</span> <span word="geese">geese</span>. <span word="The">The</span> <span word="group">group</span> <span word="contains">contains</span> 30% <span word="male">male</span> <span word="geese">geese</span>. <span word="Among">Among</span> <span word="the">the</span> <span word="geese">geese</span> <span word="that">that</span> <span word="later">later</span> <span word="on">on</span> <span word="migrated">migrated</span>, 20% <span word="are">are</span> <span word="male">male</span>. <span word="What">What</span> <span word="is">is</span> <span word="the">the</span> <span word="ratio">ratio</span> <span word="of">of</span> <span word="migration">migration</span> <span word="factor">factor</span> <span word="for">for</span> <span word="male">male</span> <span word="geese">geese</span> <span word="to">to</span> <span word="the">the</span> <span word="migration">migration</span> <span word="facotr">facotr</span> <span word="for">for</span> <span word="female">female</span> <span word="geese">geese</span>?</p><p> <span word="Solution">Solution</span>: <span word="Assume">Assume</span> <span word="total">total</span> <span word="geese">geese</span> <span word="X">X</span>, <span word="of">of</span> <span word="which">which</span> <span word="Y">Y</span> <span word="migrated">migrated</span>.</p><p> <span word="The">The</span> <span word="answer">answer</span> <span word="is">is</span> <span word="simple">simple</span> / = ...</p><p> 62.<span word="Some">Some</span> <span word="guy">guy</span> <span word="has">has</span> 6 <span word="albums">albums</span> <span word="of">of</span> <span word="anthology">anthology</span> <span word="from">from</span> <span word="which">which</span> <span word="he">he</span> <span word="read">read</span> <span word="one">one</span> <span word="poem">poem</span> <span word="at">at</span> <span word="least">least</span>. <span word="All">All</span> <span word="peoms">peoms</span> <span word="in">in</span> <span word="the">the</span> <span word="albums">albums</span> <span word="are">are</span> <span word="different">different</span>. <span word="Did">Did</span> <span word="he">he</span> <span word="read">read</span> <span word="more">more</span> <span word="than">than</span> 6 <span word="poems">poems</span> <span word="from">from</span> <span word="at">at</span> <span word="least">least</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="album">album</span>?</p><p> <span word="a">a</span>) <span word="he">he</span> <span word="has">has</span> <span word="read">read</span> 22 <span word="poems">poems</span> <span word="in">in</span> <span word="total">total</span>.</p><p> <span word="b">b</span>) <span word="the">the</span> <span word="numbers">numbers</span> <span word="of">of</span> <span word="poems">poems</span> <span word="he">he</span> <span word="read">read</span> <span word="from">from</span> <span word="each">each</span> <span word="album">album</span> <span word="are">are</span> <span word="all">all</span> <span word="distinct">distinct</span>.</p><p> <span word="Anwser">Anwser</span>: <span word="C">C</span></p><p> 63. <span word="k">k</span>, <span word="l">l</span>, <span word="m">m</span> <span word="are">are</span> <span word="positive">positive</span> <span word="integers">integers</span>, <span word="does">does</span> <span word="k">k</span> <span word="has">has</span> <span word="more">more</span> <span word="prime">prime</span> <span word="factors">factors</span> <span word="than">than</span> <span word="m">m</span></p><p> <span word="a">a</span>) <span word="k">k</span> = 30<span word="l">l</span></p><p> <span word="b">b</span>) <span word="m">m</span> = 10^<span word="k">k</span></p><p> <span word="Answer">Answer</span>: <span word="C">C</span></p>
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