To set the response inside a numeric question or response, you can use the code below.
Note: the answers start at index 0, so the first answer in your list will be 0, the second 1 etc.
Best practice is to take the code of the answer and subtract 1.
Be sure to add the next auto click.
(this example assumes you have 1 numeric box box on the page).
function pageReady(){
$(".numeric-decimal-input").val(5).trigger("input");
//5 is the numeric value we are setting
setTimeout(function() {
$('.main-next-button').click();
}, seconds * 100);
}