Chapter 8.1, Problem 20E

To determine

(a)

To express:

The probability $P\left(X\le 1.2\right)$ in the terms of $F\left(z\right)$ and also compute its value.

To determine

(b)

To express:

The probability $P\left(X\ge -0.4\right)$ in the terms of $F\left(z\right)$ and also compute its value.