Re: [哈啦] 統計@@
※ 引述《TRX ()》之銘言：
: a lecture hall has 200 seats with folding arm tables, 30 of which
: are designed for left-handers. The average size of classes that
: meet there is 188, and we can assume that about 13% of the students
: are left-handed. what's the probability that a right-handed student
: in one of these classes is forced to use a lefty arm tablet?
我覺得這是說全班有200人
如果全班是188人的話，那13%的左撇，那左撇的人數=24.44
1.人數不是整數
2.188-25 = 163
右撇的座位有170個，不會有右撇被逼去坐左撇位
所以我翻題意應該是
有200人的教室中，該教室有為左撇者30設計座位
某班200人，其中有26人是左撇、174人是右撇
當某次有188人來上課時，有一位右撇者需要坐在左撇座位的機率
也就是要算當188人來上課時，右撇人數 = 171 的機率為何
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