In the decimal representation of X , where 0<x<1, is the tenths digit of x nonzero?
1) 16x is an integer
2) 8x is a integer
Yesterday each of the 35 members of a certain task force spent some time working on project P. the graph shows the number of hours and the numbers who spent that number of hours working on project P yesterday(9members working 1 hours;4members for 2hours; 1 members for 3hours; 2members for 4hours; 1members for 5hours; 8 members for 6hours; 10 members for 7 hours ). What was the median number of hours that the members of the task force spent working on project P yesterday ?
2
3
4
5
6
7
第一题应该是问小数点10位上的情况吧。
我觉得是B.因为1/16是0.0625
第二题就是就加重平均数。
151(9*1+4*2+1*3+2*4+1*5+8*6+10*7)/35
第2题其实不用那么复杂用公式去做,直接数下就得:
总共有35个人,求中数,所以就看第18个就行了,然后再看图就是6hours了,记得是GWD上的题.
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