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true or false: a)Var(X)=E(X^2)-E(X)^2) is always true b)if A and B are dependent then P(A interesection...

true or false:
a)Var(X)=E(X^2)-E(X)^2) is always true
b)if A and B are dependent then P(A interesection B) - P(A)P(B)=1
c)one of the desavantages of the average is it small sensibility at data change
d) Pearson coefficient does not indicate the assimetria of a empiric distribution

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