GMAT数学精华题型解析(4)
<p> <span word="GMAT">GMAT</span>数学考试常见题型的解题技巧有哪些呢?以下将为大家深入分析<span word="GMAT">GMAT</span>数学考试常见题型的解题策略和技巧，希望能够为考生备战<span word="GMAT">GMAT</span>数学考试带来帮助。</p><p> 106. 11122-!-<span word="item">item</span>-!-187;#058007588</p><p> <span word="If">If</span> <span word="a">a</span> <span word="certain">certain</span> <span word="sample">sample</span> <span word="of">of</span> <span word="data">data</span> <span word="has">has</span> <span word="a">a</span> <span word="mean">mean</span> <span word="of">of</span> 20.0 <span word="and">and</span> <span word="a">a</span> <span word="standard">standard</span> <span word="deviation">deviation</span> <span word="of">of</span> 3.0, <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="values">values</span> <span word="is">is</span> <span word="more">more</span> <span word="than">than</span> 2.5 <span word="standard">standard</span> <span word="deviations">deviations</span> <span word="from">from</span> <span word="the">the</span> <span word="mean">mean</span>?</p><p> 12.0</p><p> 13.5</p><p> 17.0</p><p> 23.5</p><p> 26.5</p><p> 【答案】 <span word="A">A</span></p><p> 几倍的标准差，就用平均值加减几倍的标准差，即为新的值域</p><p> 110. 11364-!-<span word="item">item</span>-!-187;#058007646</p><p> <span word="The">The</span> <span word="residents">residents</span> <span word="of">of</span> <span word="Town">Town</span> <span word="X">X</span> <span word="participated">participated</span> <span word="in">in</span> <span word="a">a</span> <span word="survey">survey</span> <span word="to">to</span> <span word="determine">determine</span> <span word="the">the</span> <span word="number">number</span> <span word="of">of</span> <span word="hours">hours</span> <span word="per">per</span> <span word="week">week</span> <span word="each">each</span> <span word="resident">resident</span> <span word="spent">spent</span> <span word="watching">watching</span> <span word="television">television</span>. <span word="The">The</span> <span word="distribution">distribution</span> <span word="of">of</span> <span word="the">the</span> <span word="results">results</span> <span word="of">of</span> <span word="the">the</span> <span word="survey">survey</span> <span word="had">had</span> <span word="a">a</span> <span word="mean">mean</span> <span word="of">of</span> 21 <span word="hours">hours</span> <span word="and">and</span> <span word="a">a</span> <span word="standard">standard</span> <span word="deviation">deviation</span> <span word="of">of</span> 6 <span word="hours">hours</span>. <span word="The">The</span> <span word="number">number</span> <span word="of">of</span> <span word="hours">hours</span> <span word="that">that</span> <span word="Pat">Pat</span>, <span word="a">a</span> <span word="resident">resident</span> <span word="of">of</span> <span word="Town">Town</span> <span word="X">X</span>, <span word="watched">watched</span> <span word="television">television</span> <span word="last">last</span> <span word="week">week</span> <span word="was">was</span> <span word="between">between</span> 1 <span word="and">and</span> 2 <span word="standard">standard</span> <span word="deviations">deviations</span> <span word="below">below</span> <span word="the">the</span> <span word="mean">mean</span>. <span word="Which">Which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="could">could</span> <span word="be">be</span> <span word="the">the</span> <span word="number">number</span> <span word="of">of</span> <span word="hours">hours</span> <span word="that">that</span> <span word="Pat">Pat</span> <span word="watched">watched</span> <span word="television">television</span> <span word="last">last</span> <span word="week">week</span>?</p><p> 30</p><p> 20</p><p> 18</p><p> 12</p><p> 6</p><p> --------------------------------------------------------------------------------------------------------------------------------</p>
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