Sure, I can help you with that! Here's a

1. step-by-step guide

on how to create a formula to group ages into age ranges in Excel:

1. First, you need to decide on the age ranges you want to use. In your case, you've already listed them as 16-20, 21-30, 31-40, 41-50, 51-60, 61-70, and 71-80.

2. Next, you'll need to create a formula in Column L that will group the ages in Column K into the appropriate age range. Here's an example formula you can use:

This formula uses nested IF statements to check the age in Column K and assign it to the appropriate age range in Column L. You'll need to adjust the cell references (K2) to match the cell where your first age is listed.

3. Once you've entered the formula in the first cell of Column L, you can copy and paste it down the rest of the column to apply it to all the ages in your dataset.

4. Finally, you can use the age ranges in Column L to create a pivot chart that shows the frequency of each age group. To do this, select your data range (including both columns K and L), go to the Insert tab, and click on PivotChart. Follow the prompts to create your chart, and be sure to include the age range field in the chart's axis or legend.

Let me know if you have any questions or need further assistance.