diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index b22590bc6..552d0a9be 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -6,9 +6,32 @@
 // or 'list' has mixed values (the function is expected to sort only numbers).
 
 function calculateMedian(list) {
-  const middleIndex = Math.floor(list.length / 2);
-  const median = list.splice(middleIndex, 1)[0];
-  return median;
-}
+  if (!Array.isArray(list) || list.length === 0) {
+    return null;
+  }
+  const numbersOnly = list.filter(element => typeof element === 'number');
+  //console.log (numbersOnly);
+  if (numbersOnly.length === 0) {
+    return null;
+  }
+
+  const sortedList = [...numbersOnly].sort((a, b) => a - b);
+
+  if (sortedList.length % 2 === 0) {
+  const middleIndex = Math.floor(sortedList.length / 2);
+  return (sortedList[middleIndex - 1] + sortedList[middleIndex]) / 2;
+  }
+   const middleIndex = Math.floor(sortedList.length / 2);
+
+  return sortedList[middleIndex];
+  
+
+
+  //return median;
+   }
+
+const salaries = [10, 40, 50, 70, 90]
+const median = calculateMedian(salaries);
 
 module.exports = calculateMedian;
+
diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index 781e8718a..2aa451654 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1 +1,9 @@
-function dedupe() {}
+function dedupe(list) {
+    if (!Array.isArray(list)) {
+        return [];
+    }
+
+    return [...new Set(list)];
+}
+
+module.exports = dedupe;
diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index 6dd76378e..eff491b6e 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,4 +1,12 @@
 function findMax(elements) {
+    if (!Array.isArray(elements) || elements.length === 0) {
+        return -Infinity;
+    }
+    const numbersOnly = elements.filter(item => typeof item === 'number' && !isNaN(item));
+    if (numbersOnly.length === 0) {
+        return -Infinity;
+    }
+    return Math.max(...numbersOnly);
 }
 
 module.exports = findMax;
diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 9062aafe3..73715b25a 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,4 +1,16 @@
 function sum(elements) {
+    if (!Array.isArray(elements) || elements.length === 0) {
+    return 0;
+  }
+
+  const numbersOnly = elements.filter(item => typeof item === "number" && !isNaN(item));
+
+  if (numbersOnly.length === 0) {
+    return 0;
+  }
+
+  return numbersOnly.reduce((acc, curr) => acc + curr, 0);
+
 }
 
 module.exports = sum;