Re: [哈啦] 統計@@
※ 引述《cman (南無觀世Impreza)》之銘言：
: 200個位子 170右座 30左座
: 右撇子有87% 左撇子有13% (這個全部學生的平均左撇 還是 來上課總人數的左撇)
: 我先以全部學生平均左撇率來算
: 先來個P(右座)=170/200=0.85
: P(左座)= 0.15
: P(右撇)=0.87
: P(左撇)=0.13
: P(左座 交集 右撇) 0.15* 0.87
: P(左座|右撇)=---------------------= -------- =0.15 ?
: P(右撇) 0.87
: 腦袋好多問號 囧
: 上課平均人數185人?(我不知道怎麼弄)
: 貝氏
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?
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