I'm stuck on 3 c and 3 d if anyone can help thanks!

d) P(z s 1.08) 3. Assume that x is normally distributed random variable with mean 20 and variance 16. Compute the following: (for parts (c) and ((1) use x; = 21) a} Value of x' such that P(x 5 x') = 0.6255 b) Value of x\" such that P(x 5 x') = 0.2578 0) Value of x; such that P(x{ 2 x 2 x5) = 0.5 (1) Value of x; such that P(x{ S x 5 x5) = 0.3 h