Help: some math JJ of Jan.
1. 数学碰到一到方差的，题目是73、76、89、93、100、100、105、105、105，这几个数字不确定，但是平均数是100，方差是22.4，问有几个数不在方差内，
请教解题过程。
2. PS: bob saved a portion of his income this year and spent all the rest. For each dollar he saved this year, he can get 1+r dollar next year. If bob does not have any income next year and the savings is the only money he has, how much is the proportion he saved this year in terms of r if the money he have next year is half the money he spent this year
求什么？
3. Height-2 means: maximum n so that 2^n is factor of N
what's n? 1) forget 2) 63
N 都不知道，怎么解？
4. x is a Integer, 0 < x < 500, x divde by 7, remainder 1, x divide by 3 remainder 2, ask what is x:
a. 2 b. 15 c 16 d 26 e 300
我得8，29，71。。。
5. 一个工厂的工人工资从50涨到60，PARTS涨了原来的8%，现在做了1。5小时，按原价算价钱是1250，问按现价算增长的是按原价算的百分之几。选项有14%,12又二分之一%等
是不是知道PARTS得人数，就可以做了？
6. in a x-y-z,system, a point S (x,y,z), x,y,z are integers-6 My answer is 110.
说的是什么意思？
Thanks in advance! |
