That is not an attempt to solve the problem at hand.
It is just boiler-plate code (that you may simply have copied).
Are you claiming you know how to read a file into an array but not how to loop in Perl?
Your problem is to parse the data then partition the data and compute mean and std dev on the paritions.
Before I provide any more feedback I would like to see an attempt there as otherwise I have the feeling you are simply trying to free-ride.
This site is the Perl-monks, not the homework-monks.
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