问题描述：
两道SAT2数学题
1. A hotel has five single rooms available, for which six men and three women apply.What is the probability that the rooms will be rented to three men and two women?
2.Of all the articles in a box, 80% are satisfactory, while 20% are not. The probability of obtaining exactly five good items out of eight randomly selected articles is?
请附上详细过程及讲解.
另外,第二题答案上是这样说的.
Since the problem doesn't say how many articles are in the box, we must assume that it is an unlimited number. The probability of picking 5 satisfactory items(and therefor 3 unsatisfactory ones) is （0.8）5（0.2）3,这里5和3是次方.and there are(85){前面小括号里85是竖排的,上面是8,下面是5,请问这里什么意思}ways of doing this.Therefore, the desired probability is(85)(0.8)5(0.2)3约等于 0.147 .最后这个式子是怎么回事?
1. A hotel has five single rooms available, for which six men and three women apply.What is the probability that the rooms will be rented to three men and two women?
2.Of all the articles in a box, 80% are satisfactory, while 20% are not. The probability of obtaining exactly five good items out of eight randomly selected articles is?
请附上详细过程及讲解.
另外,第二题答案上是这样说的.
Since the problem doesn't say how many articles are in the box, we must assume that it is an unlimited number. The probability of picking 5 satisfactory items(and therefor 3 unsatisfactory ones) is （0.8）5（0.2）3,这里5和3是次方.and there are(85){前面小括号里85是竖排的,上面是8,下面是5,请问这里什么意思}ways of doing this.Therefore, the desired probability is(85)(0.8)5(0.2)3约等于 0.147 .最后这个式子是怎么回事?
问题解答：
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