Suppose a continuous random variable X has probability density function: ,Which of the following graphs represents this function? 8 The time it takes Geoff to complete a crossword puzzle is normally distributed with a mean of 1 hour and a standard deviation of 12 minutes. On 10% of occasions he is able to complete the crossword in k minutes or less. Find the value of k to the nearest whole number. 查看更多

 

题目列表(包括答案和解析)


Suppose  the  least distance fron poinrs of the xurve(曲线)to the y-axis is then the velue of a is

A.B.C.orD.or

查看答案和解析>>

162、a=1是直线y=ax+1和直线y=(a-2)x-1垂直的
充要
条件.

查看答案和解析>>

1、集合A={-1,0,1},B={-2,-1,0},则A∪B=
{-2,-1,0,1}

查看答案和解析>>

函数y=
3x2
-1(x≤0)的反函数是(  )
A、y=
(x+1)3
(x≥-1)
B、y=-
(x+1)3
(x≥-1)
C、y=
(x+1)3
(x≥0)
D、y=-
(x+1)3
(x≥0)

查看答案和解析>>

已知函数f(x)=
ax2+1bx+c
(a、b、c∈Z)是奇函数,又f(1)=2,f(2)<3,求a、b、c的值.

查看答案和解析>>


同步练习册答案