[num, txt, raw] = xlsread('grades.xlsx')
midterm = num(:,2);
t = tabulate(midterm);
scores = t(:,1);
counts = t(:,2);
assign = num(:,1);
bins = 0:15;
firstp = makeNormalDis(13.8306,1.3311);
secondp = makeNormalDis(10.7675,1.9410);
x = [0,15];
figure;
a = histogram(midterm, bins); hold on;
b = histogram(assign, bins);
fplot(firstp, x, 'r');
set(findobj(gca, 'Type', 'Line', 'Color', 'r'), 'LineWidth', 1.5);
fplot(secondp, x, 'b');
set(findobj(gca, 'Type', 'Line', 'Color', 'b'), 'LineWidth', 1.5); hold off
set(gca,'XTick',bins);
ylabel('Normalized PDF');
xlabel('Grades');
legend('Midterm', 'Assignment 1', 'Location', 'northwest');
grid on;