这是加拿大BC省8年级数学入学测试题中的一题。时间要求在2分钟之内。参加者为7年级学生。请在2分钟之内告诉我你的答案。
亚伦在做多项选择题(每题只有一个正确答案), 每题有A, B, C, D 四 个选择。考试时间快到了,亚伦还有 五 道未答题。如果他随便瞎猜,结果这5题中只对了一题,请问他的猜对概率是多少?
英文如下
Aaron is doing a multiple choice test. Each question has 4 possible answers(only 1 answer is correct in each question). When the time runs out, Aaron still has 5 unanswered questions left. If Aaron randomly guesses all the questions, what is the probability of him getting only 1 question correct.
这是加拿大BC省8年级数学入学测试题中的一题。时间要求在2分钟之内。参加者为7年级学生。请在2分钟之内告诉我你的答案。
亚伦在做多项选择题(每题只有一个正确答案), 每题有A, B, C, D 四 个选择。考试时间快到了,亚伦还有 五 道未答题。如果他随便瞎猜,结果这5题中只对了一题,请问他的猜对概率是多少?
英文如下
Aaron is doing a multiple choice test. Each question has 4 possible answers(only 1 answer is correct in each question). When the time runs out, Aaron still has 5 unanswered questions left. If Aaron randomly guesses all the questions, what is the probability of him getting only 1 question correct.
五道题, 每道题四个选项,五对一,百分之二十,这还用算?