Problem reported in interviews at
For a given input matrix mat (implemented as a 2D list representing an image), calculate and return the mean thresholded matrix.
That is, return a new matrix with values of 255 and 0. Each element in the new mattrix has a value of 255 if the value in the original matrix is greater than the mean of the original matrix, and 0 otherwise.
mat: [[ 1 7 9 13 12] [11 21 61 81 91] [ 5 66 6 5 5]]
[[ 0 0 0 255 0] [ 0 255 255 255 255] [ 0 255 0 0 0]]
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numpy has been already imported as np (import numpy as np)