WE ARE USING C++

2. If a random variable X is distributed normally with zero mean and unit standard deviation, the probability that 0 3XSxis given by the standard normal function d(x). This is usually looked up in tables, but it may be approximated as follows (x)= 0.5-mat + bt2 + ct'), where a-0.4361836, b0.1201676 37298, r- expo.3/2r, and10(1+03326x) Write a function to compute dex), and use it in a program to write out its values for o s s 4 in steps of 0.1. Check d(l) 0.3413. Use the following function header float Norm( loat 3)