I n a certain animal population, for each of the fist 3 month of life,the probability that an animal will die at that month is 1/10. For a group of 200 newborn members of the population, approximately how many would be expected to survive during the first 3 months of life?
Could one help me, please.[em10]作者: passerr 时间: 2003-1-21 13:30
200*(1-1/10)^3
Is it right?作者: yahoo750 时间: 2003-1-21 15:13
Thank you, but I'm sorry to tell you that the answer is wrong. the correct answer is 146.I don't know how to get the answer.作者: isenetlab 时间: 2003-1-21 16:12
??
200*(1-1/10)^3=146
yahoo75, what r u thinking?作者: 孤注一掷 时间: 2003-1-21 22:57
让我用最笨的方式来说吧:
By the end of first month, there are 200-200*1/10=180 left;
By the end of second month, there are 180-180*1/10=162 left;
By the end of third month, there are 162-162*1/10=145.8 left, so the answer is 146.作者: yahoo750 时间: 2003-1-22 22:50
I've made it out at last! Thank you all of you!
欢迎光临 国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/)
