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syntax error at a.pl line 8, near ");"
syntax error at a.pl line 12, near ");"
Global symbol "$n" requires explicit package name at a.pl line 20.
Execution of a.pl aborted due to compilation errors.

use strict;
use warnings;
my ($i, $j, $x, $tot);
...
    $tot=$tot+(($_-$ave)^2);}
my $deviation=sqrt($tot/$n);
print "\nThe Standard Deviation of that set of numbers is $deviation.\
+n";