#!/usr/bin/perl
use strict;
use warnings;

use IO::All;
use Data::Dumper;
use List::Util qw(sum);

sub mean {
    return sum(@_)/@_;
}

my @lines = io('in.txt')->chomp->slurp;
splice @lines, 0, 1; # remove first line

my %hash;
foreach my $line (@lines) {
    $line =~ s/^\s+//;
    my @elements = split /\s+/, $line;
    my $reference = splice @elements, 0, 1;
    $hash{$reference} = mean(@elements);
}
print Dumper \%hash;

__END__

$ perl test.pl
$VAR1 = {
          'Pineapple' => '25',
          'Apple' => '47.25',
          'orange' => '22.5'
        };