Adjust evaluation function

quiz.js

@@ -7,7 +7,7 @@
  * http://creativecommons.org/publicdomain/zero/1.0/. */
 
 "use strict";
-const version = "$Id: quiz.js,v 1.28 2024/01/21 19:44:14 oj14ozun Exp oj14ozun $";
+const version = "$Id: quiz.js,v 1.29 2024/01/21 21:34:05 oj14ozun Exp oj14ozun $";
 
 const js_version  = document.getElementById("js-version");
 js_version.innerText = version;
@@ -58,7 +58,7 @@ function get_data(q) {
 
 function evaluate(q) {
     const data = get_data(q);
-    return data["right"] ** 2 - data["wrong"] + 4 * Math.random() - 2;
+    return (1 - Math.random() ** 3) * (data["right"] ** 2 - data["wrong"]) + 6 * Math.random() - 3;
 }
 
 function update_stats(q) {