在一项调查中,300 名受访者被问及他们是否拥有汽车。如果是,他们会被进一步要求提及他们是否拥有汽车或踏板车或两者兼而有之。响应列于下表。
百分之多少的受访者没有滑板车?
(一) 48
(乙) 40
(C) 50
(四) 45答案:(一)
解释:
No. of respondents do not own scooter =
No. of persons who have car alone +
No. of persons who don't have both.
In men, 40 + 20 = 60 and
In women 34 + 50 = 84.
Total 60 + 84 = 144 .
Now the percentage is, (144/300) *100 = 48
这个问题的测验