Making a Histogram When Given Cumulative Relative Frequency

I need to make a histogram of the relative frequencies of a data set. I am given the CRF, but I am confused as to how to go from the CRF to the relative frequency. Any help is appreciated thanks!

1 Answer

Let $X(i)$ be the i-th cummulative relative frequency and $r(i)$ the i-th relative frequency. The steps to calculate the $r(i)$´s are shown below:

 X(i) r(i)
1 X(1) r(1)=X(1)
2 X(2) r(2)=X(2)-X(1)
3 X(3) r(3)=X(3)-X(2)
4 X(4) r(4)=X(4)-X(3)
...
n X(n) r(n)=X(n)-X(n-1)