[計量] PP問題

[prislin (我會練好箭)]

第一題
In the sequence of positive numbers x1,x2,x3….,what is the value of x1?
1.xi=(xi-1)/2 for all integers / >1.
2.x5= x4/(x4+1)
ans: c


第二題
Are at least 10 percent of the people in countryX who are 65years old or
older employed?
1.      In countryX 11.3percent of the population is 65years old or older.
2.      In countryX of the population 65years old or older, 20 percent of the men
and 10 percent of the women are employed.
ans: b


尋求解題高手幫忙~~


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推 filley:第二題 題目求是否>=65歲人至少10%以上是被雇用的
→ filley:1) 知道全部人口11.3%是>=65歲以上的人  不充分
→ filley:2) 在>=65歲人口中 20%男人和10%女人是被雇用可先列式為
→ filley:0.2m+0.1w m和w可以代任異數進去 假設一個最小的值是
→ filley:m=0 w=1的情況下 則0.2m+0.1w=0.1 所以至少會是10% 充分選B