Problem 55240. Calculate the mean of each half of a matrix
Given a matrix with an even number of columns, n, return a 1-by-2 row vector where the first element is the mean of all the elements in the first n/2 columns, and the second element is the mean of all the elements in the second n/2 columns.
(2 = mean of [3,4,1,2,1,1], 4 = mean of [4,3,5,3,4,5])
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