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Thank you for the idea.I managed to sort the data. Now I'm having trouble to calculate the average of 'b' (sum/k).
I got the sum, but don't know how to calculate the k value.

Here's the code to...

for(i=0;i<n;i++){
fscanf(fin,"%f,%f\n",&a[i],&b[i]);
}

for(i=0;i<n;i++){

if (a[i]==60){
k=k+1;
sum=sum+b[i];
}

Hi. I have a problem that I could not figure out. I have these datasets read from a textfile (1 to N):

a1 b1
a2 b2
a3 b3
:
:
aN bN

I need to make this: