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How to calculate integral average in Excel

In Excel, you can calculate the integral average, also known as a definite integral, by using the Sumproduct and Trapz functions.

Here’s an example of how to calculate the definite integral of a set of data using these functions:

  1. Organize your data into two columns, one for the independent variable (x) and one for the dependent variable (y).
  2. Determine the range of values over which you want to calculate the definite integral.

Using Sumproduct function

Use the SUMPRODUCT function to calculate the sum of the products of the width of each rectangle (dx) and the height of each rectangle (f(x)).

The formula for this is: =SUMPRODUCT((B2:B7-B1:B6)/2, (B2:B7+B1:B6))

Multiply the result by the width of each rectangle (dx) to get the integral average.

Using Trapz function

The syntax for this function is: =TRAPZ(data_y, data_x), where data_y is the range of the dependent variable (y) and data_x is the range of the independent variable (x). For the same data set, the formula for the integral average is:

=TRAPZ(B2:B7, A2:A7)

It’s important to note that these methods are only approximations of the definite integral and the accuracy of the results depends on the size of the rectangles (dx) and the shape of the curve.

To get a more accurate result, you can use smaller rectangles (dx) or use a numerical integration method that uses more sophisticated algorithms to calculate the definite integral.

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