Question

MATLAB

% The variable sv below has the scores of a class exam.
% A for a score >=90, then B for a score >= 80, then C for a score >=70,
% then D for a score >= 60, then F.
% 1) Use only one for loop to implement the following requirements:
% 2) Check each score and find its letter grader.
% 3) Compute the numbers of students who got A, B, C, D, or F
% 4) Compute the total number of students who passed the exam.
% 5) Compute the average score
% 6) Create a vector letterScore contains the converted letter grades.(Optional)
% Refer the lab4_test_output.txt file for more details on the requirements.
if (~exist('fileID'))
fileID = fopen('lab4_test_output.txt', 'w');
end
fprintf(fileID, '\n*****Q4: loop, score analysis:\n');
sv = [83, 95, 65, 55, 100, 66, 82, 87, 96, 89, 75, 93, ...
99, 82, 67, 88, 66, 57, 77, 92];
letterScore = [];
% Write your code here:

Answer 1

Code:

sv = [83, 95, 65, 55, 100, 66, 82, 87, 96, 89, 75, 93,99, 82, 67, 88, 66, 57, 77, 92];
a=0
b=0
c=0
d=0
f=0
passed=0
avg=0
for i=1:1:length(sv)
  
avg=avg+sv(i) %for calculating average,first we will find sum

%checking the range and incrementing the appropriate grade
if sv(i)>=90
a=a+1
elseif sv(i)>=80
b=b+1
elseif sv(i)>=70
c=c+1
elseif sv(i)>=60
d=d+1
else
f=f+1
end
end

avg=avg/length(sv)

passed=a+b+c+d

%displaying the results
fprintf("The number of students who got A grade are %d\n\n",a)
fprintf("The number of students who got B grade are %d\n\n",b)
fprintf("The number of students who got C grade are %d\n\n",c)
fprintf("The number of students who got D grade are %d\n\n",d)
fprintf("The number of students who passed are %d\n\n",passed)
fprintf("The average score of students is %f\n",avg)

Output: