Use a stats module

Problem

You are given a module Stats.rakumod that exports two subroutines — total and mean — where mean is built on top of total:

unit module Stats;

sub total(@numbers) is export {
    [+] @numbers
}

sub mean(@numbers) is export {
    total(@numbers) / @numbers.elems
}

Write a separate program that uses this module and, for the list 10, 20, 30, 40, prints both the total and the mean.

Run with the module on the search path, the program prints:

$ raku -I. stats.raku
total: 100
mean: 25