Re: [計量] 一題計量麻煩大家囉
※ 引述《menzx (呆子好)》之銘言：
: if $4500 was invested in bond fund when the price per share was $9 and $3000
: was invested in the fund when the price per share was $10, what was the average
: (arithmetic mean) price per share purchased ?
: 我的解法是 (4500*9+3000*10)/(4500+3000)=9.4
: 答案是9.375
: 麻煩各位!!謝謝~
4500/9 = 500 代表第一個可以invest 500個
3000/10 = 300 代表第二個可以invest 300個
平均: (4500+3000)/(500+300) = 9.375
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