Solve all the following.thankx!!!

12. For each of the following say whether it can be the graph of a cdf. If it can be, say whether the variable is discrete or continuous. (i) F(x) (ii) F(x) (iii) 0.5 0.5 - 0.5 - (iv) (v) F(x) (vi) F(x) 0.5 - 0.5 - 0.5 - (vii) F(r) (viii ) F(x) 1 - 0.5 - 0.5 13. Normal Distribution: Throughout these problems, let o and & be the pdf and cdf, respectively, of the standard normal distribution Suppose Z is a standard normal random variable and let X = 32 + 1. (a) Express P(X x) in terms of $ (b) Differentiate the expression from (a) with respect to a to get the pdf of X, f(r). Remember that '(=) = o(=) and don't forget the chain rule (c) Find P(-1