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作者 luhungs 在 PTT [ Statistics ] 看板的留言(推文), 共8則
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2F推:Data Analysis -> Histogram08/07 08:07
1F推:May I ask how would I get the answer from here?03/16 03:51
2F→:My Idea is that P(N=x) =1/3*(2/3)^(x-1)+2/3(1/3)^(x-1)03/16 03:51
3F→:and the pmf is defined for N = 2 to infinity03/16 03:54
4F→:So E(N) is just sum xp(x) from 2 to infinity03/16 03:54
5F→:but would you point out how to use the two equations03/16 03:56
6F→:you provided to solve the problem? thank you.03/16 03:57
4F推:1. 3/2 + 3/1?03/15 01:09
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