把4千克白糖平均装在5个袋子中,每袋白糖重____千克,每袋白糖是4千克的____.
已知三个正态分布密度函数Φi(x)=12πσie-x-μi22σi2x∈R,i=1,2,3的图象如图所示,则( )
There are ___________ people in the shopping centre.