Re: 請問一題統計題目!!!
看板Statistics作者wbson (Rise of 2nd Empire )時間19年前 (2007/04/17 03:45)推噓0(0推 0噓 0→)留言0則, 0人參與討論串2/4 (看更多)
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
各位大人有錯請指教
※ 引述《posili (台中男生)》之銘言：
: 有75個正數,小數部分大於0.5進位,小於捨去,請問誤差總和在-5和5
: 之間的機率???
: 請教板上高手,謝謝~~~
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