130****37802021-10-09 13:35:03
老师您好,这里问的是计算expected number of yearly earnings increases during the next 10 years=n*p=10*0.7,那如果问的是the expected number of yearly earnings decreases during the next 10 years要如何计算呀?
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Irene2021-10-09 16:18:46
同学你好
就是用n*下降的概率(1-0.7)即可,等于3年。
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