🐚 · 2022年10月08日
NO.PZ2015120604000089
问题如下：
According to the research, 65% of all companies have a scanner. Assuming we selected 8 companis, what is the probability that five companies would have a scanner ?
选项：
A.0.138.
B.0.311.
C.0.279.
解释：
C is correct.
[8!/5!(8- 5)!](0.65) 5 (0.35) 8 - 5 = 56*(0.1160)*(0.04288) =0.279.
没有太明白为什么用这样的算法
NO.PZ2015120604000089 问题如下 Accorng to the research, 65% of all companies have a scanner. Assuming we selecte8 companis, whis the probability th five companies woulhave a scanner ? A.0.138. B.0.311. C.0.279. C is correct.[8!/5!(8- 5)!](0.65) 5 (0.35) 8 - 5 = 56*(0.1160)*(0.04288) =0.279. 请问这道题怎么按计算器
NO.PZ2015120604000089 题目应该改成65% of all companies have scanners.... whis the probability that all five companies woulhave scanners ，否则读起来有歧义
5C8请问怎么按呀
我有个小问题，5次方是用计算器怎么按呀，我忘记了~
。