请数学老师讲解 一下图片题
另外我之前问的一道题 您没有解答清楚b选项
A certain list consists of 3 different numbers. Does the median of the 3 numbers equal the average (arithmetic mean) of the 3 numbers?
(1)The range of the 3 numbers is equal to twice the difference between the greatest number and the median.
(2)The sum of the 3 numbers is equal to 3 times one of the numbers.
想问一个数学题,有一组数,问能否确定range?
1. mean is given
2. standard deviation is given
解答:
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解答:
ken@boost.org.cn老师
提问:
7/15寂静:所有员工都大于20岁. Of the 2000 employees, is the avg age at least 35?
1. 50% 员工是大于40岁
2. 25% 员工是大于65岁
这道题网上有C和E两种争论;我所不明白的点是:条件2中的25%是否包含在条件1的里面;我觉得答案应该是C。因为:35*2000=70000岁;(1)+(2)可得41*500+66*500+21*1000=74500>70000.不知道我的思路是否正确。谢谢老师的答疑!