解:N=70,n-10,M=100,m=15f1=f2=0.15 015 y ∑∑ ∑,-, i=1j=1 1015台台 10x|37525+…+280.50=2244 j=MM·y=70×100×22.444=157108 故上月柜台营业总额的估计为157108.00元 =1-=2376=12 s,=7058 ()=1=hs+f(1=)2=2.61 n解：N=70，n=10，M=100，m=15 10 15 1 1 1 1 1 1 10 15 n m ij ij i j i j y y y nm = = = = = =    1 [375.25 280.50] 22.444 10 15 = + + =  1 1 7 f = f 2 = 0.15 y NM y =  =   = 70 100 22.444 157108 故上月柜台营业总额的估计为157108.00元 2 2 1 1 1 ( ) 29.76 1 n i i s y y n = = − = −  2 2 2 2 1 1 70.58 n i i s s n = = =  1 1 2 2 2 1 2 1 (1 ) ( ) 2.61 f f f v y s s n nm − − = + =