Re: [計量] 請教幾題計量
※ 引述《INR202 ()》之銘言:
: 這是我做模考時遇到的幾個問題
: 想請教大家~
: 1.
: If one number is chosen at random from the first 1,000 positive
: integers, what is the probability that the number chosen is a
: multiple of both 2 and 8 ?
: ans:1/8
是 8的倍數肯定是 2的倍數,所以計算 8的倍數就好,1000是 8的倍數,因此總
共佔了1/8
: 2.
: Both soup S and soup T contain polyunsaturated fat, and each contains
: more saturated fat than polyunsaturated fat. Soup T contains 2 more
: grams of saturated fat and 2 more grams of polyunsaturated fat per
: serving than soup S.
: column A
: The ratio of the amount of saturated fat to the amount of polyunsaturated
: fat in soup S.
: column B
: The ratio of the amount of saturated fat to the amount of polyunsaturated
: fat in soup T.
: ANS:The quantity in column A is greater.
湯品 S和 T分別含有「聚不飽和脂肪」,而且兩種湯品中「飽和脂肪」的量又比
「聚不飽和脂肪」來的多。在每一份的 T中飽和脂肪的量比 S多了2g;聚不飽和
脂肪的量也比 S多了2g。
翻譯:分子分母同加一數比大小問題。已知飽和脂肪在兩種湯品裡面都是比較多
的,因此 Col.A、 Col.B的值都會大於 1,在此種情況下分子分母同加會變小,
所以加之前比較大,選Col.A。
: 3.
: From the event numbers between 1 to 9, two different event numbers are to
: be chosen at random. What is the probability that their sum will be 8 ?
: ans:1/6
和為 8的組合(1,7),(2,6),(3,5)共 3種。
1到 9裡面任取相異兩數總共有 9C2 = 36種,感覺答案是1/12。
: 非常感謝大家抽空幫忙~
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