Hi there! I can definitely help you with this issue.

When you have merged cells in your data, Excel treats them as a single cell, which can cause issues when creating charts. However, there is a workaround that you can use to plot your data correctly.

Here are the steps to follow:

1. Unmerge the cells that contain your data. To do this, select the merged cells, right-click, and choose "Unmerge Cells" from the context menu.
2. Copy the formula that calculates the average of the 4 cells in the row above.
3. Select the first cell where you want to paste the formula and press Ctrl + Shift + Down Arrow to select all the cells in that column that contain data.
4. Press Ctrl + 1 to open the Format Cells dialog box.
5. In the Alignment tab, check the "Wrap text" checkbox and click OK.
6. Paste the formula into the first cell and press Enter to apply it to all the selected cells.
7. Now that your data is no longer merged, you can create your chart as usual. Select the data range, including the column with the averages, and choose the chart type you want to use.
8. Once the chart is created, you can format it to your liking, including adding axis labels, titles, and legends.

I hope this helps you create your chart successfully!