1. (15 pts) This question requires: matrix manipulation, single for-loop, if/else statement,
data input, .m script file:
We have 80 number grades held in a matrix (grades.m;). The letter grades are given by
following the rule: "A" ($\ge$ 90), "B" ($\ge$ 80), "C" ($\ge$ 70), "D" ($\ge$60), "F" ($<$ 60) and
"S" ($==$0); "S" standards for sick.
Write ONE script file to:
\begin{itemize}
\item Give the letter grade to EACH number grade in the matrix;
\item Put the letter grades in a 10 x 8 matrix
\end{itemize}
The letter grade matrix should look like:
CBBBADCB
ACDBACSA
BACBBBCA
SACBBCAB
ASBBBBBB
DASBSBBA
CBCBAASA
ABBAADAB
ABAAAABA
BBCBAABC
