Problem $3$:

Download the file survey$\_$results.txt from CANVAS. The file contains data collected in

the survey which you had taken during homework $4.$ The following $6$ questions were asked

in the survey:

What is your class level?

Do you have any MATLAB $/$ coding experience prior to the course?

Which of the following lab sessions do you attend most frequently?

What grade do you expect for the course?

On average how many hours per week do you spend studying outside of class?

How difficult was the homework?

The data file has $6$ columns which contain the answers to the questions above. Note that,

when students did not answer the question, the collected data is a string 'Null'. Load the

data into MATLAB, and perform the following exercises:

$($a$)$ Make a bar graph to show the numbers of students who expect A$,$ B$,$ C$,$ D and F in

the course. Label the axes and give a title. Set $p3a=$ 'See figure $1\text{'}.$

$($b$)$ How many students have previous MATLAB$/$coding experience? Put the answer into

p$3$b$.$

$($c$)$ How many students spend less than $7$ hours studying outside of class? Put the answer

into p$3$c$.$

$($d$)$ How many sophomores said that they often attend the Friday lab session? Put the

answer into $p3d.$