Pythagorean means

sub A { ([+] @_) / @_ }
sub G { ([*] @_) ** (1 / @_) }
sub H { @_ / [+] 1 X/ @_ }

say "A(1,...,10) = ", A(1..10);
say "G(1,...,10) = ", G(1..10);
say "H(1,...,10) = ", H(1..10);

Output:

A(1,...,10) = 5.5
G(1,...,10) = 4.52872868811677
H(1,...,10) = 3.41417152147406