load jquery in console and get average age from a table

gistfile1.js

var jq = document.createElement('script');
jq.src = "http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js";
document.getElementsByTagName('head')[0].appendChild(jq);
// ... give time for script to load, then type.
jQuery.noConflict();

// get average age from this table: http://www.tdcj.state.tx.us/death_row/dr_executed_offenders.html
var ages = [],
sum = 0;
jQuery('tr').each(function(a,b) {
  var age = jQuery(b).find('td:nth-child(7)').text();
  if (age !== '') {
    ages.push(age);
    sum += parseInt(age);
  }
});
console.log(sum / ages.length);