早教吧作业答案频道 -->数学-->
GRE数学正态分布ArandomvariableYisnormallydistributedwithameanof200andastandarddeviationof10.比较theprobabilityoftheeventthatthevalueofYisgreaterthan220,与1/6.下面为答案解析:(有些看不明1-(50%
题目详情
GRE数学正态分布
A random variable Y is normally distributed with a mean of 200 and a standard deviation of 10.比较 the probability of the event that the value of Y is greater than 220,与 1/6.
下面为答案解析:(有些看不明 1-(50%+95%/2)
A random variable Y is normally distributed with a mean of 200 and a standard deviation of 10.比较 the probability of the event that the value of Y is greater than 220,与 1/6.
下面为答案解析:(有些看不明 1-(50%+95%/2)
▼优质解答
答案和解析
在180--220的概率为大约95%,大于220的概率为(1-95%)/2=0.025
看了 GRE数学正态分布Arand...的网友还看了以下:
设f(x,y)在(0,0)处连续,limx,y→0f(x,y)-1ex2+y2-1=4,则()A. 2020-05-14 …
设f(t)=∬D|xy-t|dxdy,t∈[0,1],其中D={(x,y)|0≤x,y≤1}.(1 2020-06-12 …
设f(x)为连续函数,f(0)=a,F(t)=∫∫∫Ω{z-f(x^2+y^2+z^2)]dv,其 2020-06-15 …
设f(x)在(-∞,+∞)内可导,且F(x)=f(x^2-1)+f(1-x^2),证明F'(1)= 2020-06-15 …
设函数f(x)连续,且f(0)≠0,求极限limx→0∫x0(x?t)f(t)dtx∫x0f(x? 2020-07-09 …
导数的连续性设f(x)可导,且f(0)=0,f(x)在0点的导数不为0,求w=lim(x→0){x 2020-07-16 …
设f(x)在x=0处连续,且lim[f(x)+1]x^2/x-sinx=2,则曲线y=f(x)在点 2020-08-02 …
考研数学求助设函数f(x)具有二阶连续导数,且f(x)>0,f(0)'=0,则函数z=f(x)lnf 2020-11-01 …
△=0,△<0时一元二次方程ax2+bx+c=0(a>0)的根根需要用字母代表出来△>0,△=0,△ 2020-12-27 …
有一种商品在最近30天内的价格f(t)与天数t的函数关系f(t)=t+20,(0<t<25,t∈N) 2021-01-11 …