Revert "implement correct median calculation"

This reverts commit 53fa90f.

Author: Pretty Taruvinga

Sprint-1/fix/median.js

@@ -6,21 +6,9 @@
 // or 'list' has mixed values (the function is expected to sort only numbers).
 
 function calculateMedian(list) {
-  // Filter out non-numeric values and sort the remaining numbers
-  const numbers = list
-    .filter((x) => typeof x === "number" && !isNaN(x))
-    .sort((a, b) => a - b);
-
-  if (numbers.length === 0) {
-    return null;
-  }
-
-  const mid = Math.floor(numbers.length / 2);
-  if (numbers.length % 2 === 0) {
-    return (numbers[mid - 1] + numbers[mid]) / 2;
-  } else {
-    return numbers[mid];
-  }
+  const middleIndex = Math.floor(list.length / 2);
+  const median = list.splice(middleIndex, 1)[0];
+  return median;
 }
 
 module.exports = calculateMedian;