How to Average Every 10 Rows in Excel

Using the AVERAGE and INDEX Functions

To calculate the average of every 10 rows in Excel, utilize the formula =AVERAGE(INDEX(A:A,1+10*(ROW()-ROW($B$1))):INDEX(A:A,10*(ROW()-ROW($B$1)+1))). This formula should be inserted in the first row of the data set and then dragged down to apply to subsequent groups of 10 rows. Customize the range by replacing A:A with the actual data range and adjust the number of rows by replacing the number 10 with the desired row count.

Adjusting the Formula for Different Ranges

To apply the formula to a different range, adjust the A:A reference to match your data range. For instance, if your data is in column B, use B:B. To average a different number of rows, replace each instance of 10 with the number of rows you want to average. The INDEX function creates the range, and the AVERAGE function computes the average for that range.

Dynamic Array Formulas in Excel

Keep in mind that Dynamic Array Formulas are a feature of Excel 365 and Excel 2021. These formulas, including the AVERAGE function, can spill results into multiple cells if needed. This is useful when averaging groups of rows as the formula can be entered once, and the results will fill down automatically.

Autofill for Efficiency

For efficiency, after entering the formula in the first cell, use the autofill handle to drag the formula down through the column where you want the averages to appear. This will automatically adjust the formula to average each subsequent group of 10 rows.

Common Use Cases

• 
  Analyzing decadal climate data by averaging temperature readings every 10 years
• 
  Monitoring production quality by averaging defect rates every 10 units
• 
  Assessing student performance by averaging quiz scores every 10 quizzes
• 
  Evaluating website traffic trends by averaging hits every 10 days
• 
  Measuring patient heart rate by averaging beats per minute every 10 minutes

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