P-26 Exercises Determine the probability density function for each of the follow- ing cumulative distribution functions. 4.2.8 WP F(x) = 1 − e−2x x>0 4.2.9 WP SS 0 0.2x x<0 0<x<4 F(x) = 0.04x + 0.64 1 4<x<9 9≤x 4.2.10 Determine the cumulative distribution function for the random variable in Exercise 4.1.10. Use the cumulative