For a chi-squared distribution find X 2 .such that (a) P(X 2 > X 2 ) = 0.99 when v = 4; (b) P(X

For a chi-squared distribution find X²α .such that

(a) P(X² > X²α) = 0.99 when v = 4;

(b) P(X² > X²α) = 0.025 when v = 19:

(c) P(37.652 < X² < X²_α) = 0.045 when v = 25.