function getAverage$($nums$)\{$

const sum $=$ nums.reduce$(($acc$,$ val$)=>$ acc $+$ val, $0)$;

return sum $/$ nums.length;

$\}$

function highestAverage$($numsList$)\{$

let highestAverage $=-$Infinity;

let highestIndex $=-1$;

for $($let i $=0$; i $<$ numsList.length; i$++)\{$

const subArraySum $=$ numsList$[$i$].$reduce$(($sum$,$ num$)=>$ sum $+$ num, $0)$;

const subArrayAverage $=$ subArraySum $/$ numsList$[$i$].$length;

if $($subArrayAverage $>$ highestAverage$)\{$

highestAverage $=$ subArrayAverage;

highestIndex $=$ i;

$\}$

$\}$

return highestIndex;

$\}$

$//$ TESTS

$//$ DO NOT MODIFY ANYTHING BELOW THIS LINE

const arrayA $=[1,2,3,4,5]$;

const arrayB $=[10000,-9998]$;

const arrayC $=[2,100,55,19]$;

const arrayD $=[4,8,12]$;

let score $=0$;

if $($getAverage$($arrayA$)===3)$ score$++$;

if $($getAverage$($arrayB$)===1)$ score$++$;

if $($getAverage$($arrayC$)===44)$ score$++$;

if $($getAverage$($arrayD$)===8)$ score$++$;

$//$if $($highestAverage$([$arrayA$,$ arrayB, arrayC, arrayD$])===2)$ score$++$;

$//$if $($highestAverage$([$arrayA$,$ arrayB$])===0)$ score$++$;

$//$if $($highestAverage$([$arrayA$,$ arrayD$])===1)$ score$++$;

console.log$("$You have scored $"+$ score $+"/7$ points."$)$;