Generate a matrix then add a calculated column based on first column of matrix

Good night community, how can I achieve the following using Scala:

a.       generate random number mxn matrix (0 to 1)

b.      Add another column and segment the first column of the matrix 
created into 3 cohorts as A, B,C with cutting points on 1/3, 2/3.

c.       Use mapreduce functions to get stats from each segment 
(percentile, mean, count)


Thanks in advance for this platform and the community.


Andr'es

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