hold on;

lab1=[24 190 149 70 0];
lab2=[20 171 157 17 1];
lab3=[3 73 163 37 11];
lab4=[7 81 153 21 5];
lab5=[5 46 146 21 2];
lab6=[11 45 162 18 3];
lab7=[8 31 134 29 5];

Q=[lab1' lab2' lab3' lab4' lab5' lab6' lab7'];
Q=sum(Q);


lab1=[24 190 149 70 0]*100/Q(1);
lab2=[20 171 157 17 1]*100/Q(2);
lab3=[3 73 163 37 11]*100/Q(3);
lab4=[7 81 153 21 5]*100/Q(4);
lab5=[5 46 146 21 2]*100/Q(5);
lab6=[11 45 162 18 3]*100/Q(6);
lab7=[8 31 134 29 5]*100/Q(7);

labs = [lab1;lab2;lab3;lab4;lab5;lab6;lab7];

bar(labs);
legend( 'Too Easy','Easy','Moderate','Difficult','Very Difficult');
title(' The Difficulty Level of GP106 Labs','FontSize',16);
xlabel('Lab Number','fontsize', 15);
ylabel('% of participants ','fontsize', 15);

w=[1:5];
x = 1:7;

for i = 1:7
   t= labs(i,:).*w;
   y(i)=sum(t)/5;
end

plot(y);
plot(x, y, 'x');

for i=1:length(y)
   t = num2str(y(i), '%.2f');
   text(i,y(i),t);
end