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2. (2+7+0+0+x) /3 =3
9+x=15
x= 6
3. śr. x = 0*2+1*4+2*2+3*1+4*1+5*3 / 15 = 30/15=2
Xi - śr x -2 -1 0 -1 -1 1
(Xi - śr (x)) do kwadratu 4 1 0 1 1 1
C) W = U { 4*4+1*4+0*2+1*1+1*1+1*3}{15} = 1,66666666666667
dalszych punktów nie wiem