Randomly select all radio buttons on a form

random_radio.js

var a = document.querySelectorAll('input[type=radio]');
for (var i=0; i<a.length; i++)
    // from https://stackoverflow.com/a/18066088/8148848
  a[i].checked = ( (Math.random()*10) > 5) ? true : false;

hii can only chacked 10 rendom only

can limit the generate random
eg- all radio input is 50
when click on button chacked only rendom 10