math 3 15

3422 σ 2 3422 X σ2 X 3422 median 3422 3422 mode 3422 3 64225 64225 3 mean 3 p X X3 p 3 p X moment 3 p X xy 3 7 ( x+y 3 7 ) x+y 3 7 i j i 15 j 59 ij [ mi,j | mi,j = ij ; i 15 j 59 ] A detA A AT V1 V1 12 34 1 12 ( 12 34 ) 1 = ( 12 ) A B a b θ N A×B = a b sinθ N A B a b θ A.B = a b cosθ A B AB 42 42Z 44.997 44.997R 22 7 22/7 Q 1729 1729N 1729 17+29i C 17 17P 1 lne = 1