 Hi, this is Dr. Don. I had a question about how to add a cumulative frequency curve to a histogram if you don't have the data analysis tool pack. All you need is your basic histogram. Here we've got it set up. We're going to add a column for our cumulative frequencies and all we need to do is just to go equal, get our first cell, and then the second cell is equal to of course the cumulative which is the sum of the first cell and the second cell. Now I can just copy that down to get my values for my cumulative frequency. Now to add it to the existing chart we just click inside the chart area to make sure you've got the chart selected and then right click select data and when it opens up it'll show you the data series that you already have over here highlighted in the marching ants and if you wanted to edit it you could just click on edit but right now I'm just going to add so I'm going to click add and it wants in the first cell the series name make sure you've got a title that you want in a cell and I want to click that although I think you can actually type in a label there a text value if you want but I'm going to do it this way so I could go back and modify that in the future if I need my series values make sure you delete the stuff that's already in there if you leave any of that in there it won't work so delete it make sure it's clean and then select your values and then click okay and okay and you can see it offers up not quite what we want we've got two histograms or two bar charts actually because we haven't cleaned that one up yet all we need to do is to click on one of the orange bars which is our cumulative and then we're going to change series chart type and we've got some options up here you can hover over those there's the custom which is what we have now and we could have the stacked area which is not what we want we've got a clustered column with the line on a secondary axis which is what we want I think and we've got just the custom column with a line which would be on the primary axis let's select the one with the line on the secondary axis that looks good so I'm going to click okay so there I've got my histogram with the cumulative frequency line added and of course you would probably want to go over here and add a legend and then add your titles as appropriate to your axes and to the chart but that's the basics of adding a secondary data set hope this helps