4.Which one of the following statements about x^2 distributions is true?

a. A x^2 distribution with 20 degrees of freedom is more strongly skewed right than a x^2 distribution with 2 degrees of freedom

b. For any positive number C, P(x^2>C) < P(x^2 > 2C)

c. P(x^2>0) =P(x^2 < 0)

d. In any x^2 distribution, the median is greater than the mean

e. For any x^2 distribution, P(x^2 less than or equal to 0)=1