【单选题】2014年3月,取得建造师资格证书的王某受聘并注册于甲公司,2015年6月工作单位变动后变更注册于乙公司,其变更后的注册有效期到( )止。
【单选题】The probability density function f ( x ) of a random variable X that is normally distributed is completely determined once the:
A.
mean and median of X are specified.
B.
median and mode of X are specified.
C.
mean and mode of X are specified.
D.
mean and variance of X are specified.
【单选题】Suppose a random variable X can take -1,0,1,2,3, and their corresponding probability is , , , , , then c=
【判断题】A random variable X is called symmetric about zero if for all x onthe real line, 【图片】. Suppose【图片】 is symmetric,then 【图片】.
【判断题】A random variable X is normally distributed with a mean of 150 and a variance of 36. Given that X = 120, its corresponding z -score is 5.0.
【单选题】摄像机的光学系统一般是由、色温滤色片、基色分光系统等组成的( )。
【单选题】The weighted average of the possible values that a random variable X can assume, where the weights are the probabilities of occurrence of those values, is referred to as the:( )