Re: [計量] 請教幾題印度機經
※ 引述《cyndilin (cyndi)》之銘言：
: 9. If the Arithematic mean of a list of 65 items is 'p' and arithematic mean
: of a list of 92 items 'n'. When the the two lists are combined the average
: mean is 84 then what is the value of p/n?
(65p+92n)/(65+92)=84
65p+92n = 84 * (65+92)
有選項嗎?
不然p=n=84 就是答案
: A number line is given in which three pionts are given as n, n+2, -n+2 on a
: number scale.
: Col A: -n+2
: Col B: 4
不懂啥是 on a number scale
如果是講等差級數
n+2 - n = -n+2 - (n+2)
2 = -2n
n = -1
所以-n + 2 = 3 < Col B
: Given that the range of 6 consecutive positive numbers is 6.8 and of 7
: consecutive numbers is 13.2. If none of these numbers in the two groups are
: same, what would be the range of the 13 numbers?
六個'連續'正數的範圍如何有小數? 還請其他高手解答~
: There 20 students in a class, half of the students are boys. If 7 members
: should be selected out... and of which if 6 are girls find the probability
: that the 7th member is also a girl?
10 boys, 10 girls
已知七個人有六個女生 所以剩4個女生
4/14 = 2/7
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