(B) dfrac (1)(n+1)sum _(i=1)^n(({X)_(i)-overline (X))}^2 .-|||-(C) dfrac (1)(n)s
,(x)_(n),(x)_(n+1) 是来自N(μ,σ^2)的样本, overrightarrow ({x)_(n)}=dfrac (1)(n)sum _(i=
7.设-|||-._(1)=2 , _(n+1)=dfrac (1)(2)((x)_(n)+dfrac (2)({x)_(n)}) , n=1 ,2,3,...
,(X)_(n+1))(ngt 1) 取自总体 sim N(mu ,(sigma )^2) . overline (X)=dfrac (1)(n)sum _(i
化工原理蒸馏部分模拟试题及答案⏺_(n+1)=dfrac (R)(R+1)(x)_(n)+dfrac ({x)_(n)}(R+1)=dfrac (3.6)(4.
,(X)_(n+1))(ngt 1) 取自总体 sim N(mu ,(sigma )^2) , overline (X)=dfrac (1)(n)sum _(i
2.设(X1,···,xn,xn+1)是取自正态总体N (μ,σ^2)的样本,求 =(x)_(n+1)-dfrac (1)(n+1)sum _(i=1)^n+1
(6)设 _(n)=dfrac (3)(2)(int )_(0)^dfrac (n{n+1)}(x)^n-1sqrt (1+{x)^n}dx, 则极限limna
).-|||-(1)证明:limxn存在,并求该极限.-|||-n→∞-|||-(2)计算 lim _(narrow infty )((dfrac {{x)_(
求幂级数 sum _(n=1)^infty n(n+1)(x)^n 的收敛域及和函数并求 sum _(n=1)^infty dfrac (n(n+1))({2)