討論串[理工] 一題機率
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我用MGF證好了 跟特徵函數是一樣的意思. Mx(t)=E[exp(tx)]. Y=(X1+...+Xn)/n. 這題目少了個假設 , Xi is i.i.d. ---(*). by (*). we can get. My(t)=E[exp(ty)]=E[exp(t(x1+...+xn)/n)].
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題目:. A bar or length L is broken into three pieces at two random spots.. What is the probability that the length of at least one piece is less. than L
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1.A class has three students. They toether participate in 10 courses.. Each student has one favorite course. Let X be the number of courses. that are
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