This is the formula —

Parameters:
array: Input array or object having the elements, including Nan values, to calculate the arithmetic mean .
axis: Axis along which the mean is to be computed. By default axis = 0.Returns: Arithmetic mean of the array elements (ignoring the Nan values) based on the set parameters.
Code # 1:
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Output:
Arithmetic Mean using nan mean : 10.333333333333334 Arithmetic Mean without handling nan value: nan
Code # 2: with multidimensional data
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Output:
Arithmetic Mean is: nan Arithmetic Mean handling nan: 6.444444444444445 Arithmetic Mean is with default axis = 0: [nan nan nan] Arithmetic Mean handling nan with default axis = 0: [2.33333333 5. 12.] Arithmetic Mean is with default axis = 1: [10.33333333 nan nan nan] Arithmetic Mean handling nan with default axis = 1: [10.33333333 4.5 4.5 4.5]