$[20]$ Q$3$: Arithmetic operations in Matlab are subject to roundoff errors. Write a Matlab code that

demonstrates this behavior by summing the same number $"a"$ multiple times and compares the

result with respect to the "true" sum.

Roundoff Error $=|1-({\displaystyle \underset{i=1}{\overset{n}{}}}a)|,$ where $a=\frac{1}{n}$

Run your Matlab script for the $n$ values given in the list below. Fill in the table and plot $n$ vs$.$

roundoff error.