A spreadsheet containing sales data for different items, including the quantity sold in each month. The data

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Question:

A spreadsheet containing sales data for different items, including the quantity sold in each month. The data is categorized into different groups using a filter (such as A, B, C, z, y, x). I need to calculate the average absolute error for each item, but the number of months that an item was sold varies, making it difficult to calculate a fixed average for all items. Additionally, there are empty cells between each item to separate them.

I am looking for a dynamic average function that can calculate the average absolute error for each item based on the number of months it was sold. I propose using the empty cells between each item as a boundary to determine the size of the data and to tell Excel to calculate the average for each item based on the data between the first and last empty cell.

Please help me create a dynamic average function that can calculate the average absolute error for each item based on its sales data, using the empty cells between each item as a boundary to determine the size of the data