设总体的概率密度为,其中为未知参数,设是取自总体的简单随机样本,(1)求的矩估计量;(2)讨论矩估计量的无偏性.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧