作者wbson (Rise of 2nd Empire )
看板Statistics
标题Re: 请问一题统计题目!!!
时间Tue Apr 17 03:45:42 2007
The error X_i follows i.i.d Uniform(0, 0.5) i = 1~75
E(X_i) = 0.25
Var(X_i) = 1/48
E(sum(X_i)) = 75*0.25 = 18.75
Var(sum) = 75/48 = 1.5625
Using normal approximation........
Anyway, the probability of the summation of errors falls between -5 and 5
is very close to 0
各位大人有错请指教
※ 引述《posili (台中男生)》之铭言：
: 有75个正数,小数部分大於0.5进位,小於舍去,请问误差总和在-5和5
: 之间的机率???
: 请教板上高手,谢谢~~~
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