diff --git a/Sprint-1/fix/median.js b/Sprint-1/fix/median.js
index b22590bc6..a2a10dd9d 100644
--- a/Sprint-1/fix/median.js
+++ b/Sprint-1/fix/median.js
@@ -6,8 +6,19 @@
 // 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];
+  if (!Array.isArray(list)) return null;
+  
+  const numbers = list.filter(val => typeof val === 'number');
+  if (numbers.length === 0) return null;
+  numbers.sort((a, b) => a - b);
+  
+  if (numbers.length % 2 === 0) {
+    const mid1 = numbers[numbers.length / 2 - 1];
+    const mid2 = numbers[numbers.length / 2];
+    return (mid1 + mid2) / 2;
+  }
+  const middleIndex = Math.floor(numbers.length / 2);
+  const median = numbers[middleIndex];
   return median;
 }
 
diff --git a/Sprint-1/implement/dedupe.js b/Sprint-1/implement/dedupe.js
index 781e8718a..d43d1c419 100644
--- a/Sprint-1/implement/dedupe.js
+++ b/Sprint-1/implement/dedupe.js
@@ -1 +1,10 @@
-function dedupe() {}
+function dedupe(list) {
+    let listWithoutDuplicates = [];
+    for (let i = 0; i < list.length; i++) {
+        if(listWithoutDuplicates.includes(list[i]) === false) {
+            listWithoutDuplicates.push(list[i]);
+        }
+    }
+    return listWithoutDuplicates;
+}
+module.exports = dedupe;
\ No newline at end of file
diff --git a/Sprint-1/implement/dedupe.test.js b/Sprint-1/implement/dedupe.test.js
index 23e0f8638..c1cb9512d 100644
--- a/Sprint-1/implement/dedupe.test.js
+++ b/Sprint-1/implement/dedupe.test.js
@@ -25,3 +25,19 @@ test.todo("given an empty array, it returns an empty array");
 // Given an array with strings or numbers
 // When passed to the dedupe function
 // Then it should remove the duplicate values, preserving the first occurence of each element
+
+describe("dedupe", () => {
+    it("given an empty array, it returns an empty array", () => {
+        expect(dedupe([])).toEqual([]);
+    });
+    
+    it("given an array with no duplicates, it returns a copy of the original array", () => {
+        expect(dedupe([1, 2, 3])).toEqual([1, 2, 3]);
+    });
+
+    it("given an array with strings or numbers, it removes the duplicate values, preserving the first occurrence of each element", () => {
+        expect(dedupe(['a','a','a','b','b','c'])).toEqual(['a','b','c']);
+        expect(dedupe([5, 1, 1, 2, 3, 2, 5, 8])).toEqual([5, 1, 2, 3, 8]);
+        expect(dedupe([1, 2, 1])).toEqual([1, 2]);
+    });
+});
\ No newline at end of file
diff --git a/Sprint-1/implement/max.js b/Sprint-1/implement/max.js
index 6dd76378e..d4e02ce5f 100644
--- a/Sprint-1/implement/max.js
+++ b/Sprint-1/implement/max.js
@@ -1,4 +1,11 @@
 function findMax(elements) {
+let max = -Infinity;
+for (let i = 0; i < elements.length; i++) {
+  if (typeof elements[i] === "number" && elements[i] > max) {
+    max = elements[i];
+  }
+}
+return max;
 }
 
-module.exports = findMax;
+module.exports = findMax;
\ No newline at end of file
diff --git a/Sprint-1/implement/max.test.js b/Sprint-1/implement/max.test.js
index 82f18fd88..49ba64599 100644
--- a/Sprint-1/implement/max.test.js
+++ b/Sprint-1/implement/max.test.js
@@ -41,3 +41,28 @@ test.todo("given an empty array, returns -Infinity");
 // Given an array with only non-number values
 // When passed to the max function
 // Then it should return the least surprising value given how it behaves for all other inputs
+
+describe("max", () => {
+    test("given an empty array, returns -Infinity", () => {
+        expect(findMax([])).toBe(-Infinity);
+    });
+
+    test("given an array with one number, returns that number", () => {
+        expect(findMax([42])).toBe(42);
+    });
+    test("given an array with both positive and negative numbers, returns the largest number overall", () => {
+        expect(findMax([-10, 0, 5, -20, 15])).toBe(15);
+    });
+    test("given an array with just negative numbers, returns the closest one to zero", () => {
+        expect(findMax([-50, -20, -5, -1])).toBe(-1);
+    });
+    test("given an array with decimal numbers, returns the largest decimal number", () => {
+        expect(findMax([1.5, 2.3, 0.7, 3.8])).toBe(3.8);
+    });
+    test("given an array with non-number values, returns the max and ignores non-numeric values", () => {
+        expect(findMax(['hey', 10, 'hi', 60, 10])).toBe(60);
+    });
+    test("given an array with only non-number values, returns the least surprising value given how it behaves for all other inputs", () => {
+        expect(findMax(['hey', 'hi', 'hello'])).toBe(-Infinity);
+    }); 
+});
\ No newline at end of file
diff --git a/Sprint-1/implement/sum.js b/Sprint-1/implement/sum.js
index 9062aafe3..13d33c496 100644
--- a/Sprint-1/implement/sum.js
+++ b/Sprint-1/implement/sum.js
@@ -1,4 +1,11 @@
 function sum(elements) {
+    let total = 0;
+    for (let element of elements) {
+        if (typeof element === 'number') {
+            total += element;
+        }
+    }
+    return total;
 }
 
 module.exports = sum;
diff --git a/Sprint-1/implement/sum.test.js b/Sprint-1/implement/sum.test.js
index dd0a090ca..62dea20e9 100644
--- a/Sprint-1/implement/sum.test.js
+++ b/Sprint-1/implement/sum.test.js
@@ -34,3 +34,28 @@ test.todo("given an empty array, returns 0")
 // Given an array with only non-number values
 // When passed to the sum function
 // Then it should return the least surprising value given how it behaves for all other inputs
+describe("sum", () => {
+    test("given an empty array, returns 0", () => {
+        expect(sum([])).toBe(0);
+    });
+
+    test("given an array with just one number, returns that number", () => {
+        expect(sum([5])).toBe(5);
+    });
+
+    test("given an array containing negative numbers, returns the correct total sum", () => {
+        expect(sum([-1, -2, -3])).toBe(-6);
+    });
+
+    test("given an array with decimal/float numbers, returns the correct total sum", () => {
+        expect(sum([1.5, 2.5, 3.0])).toBe(7.0);
+    });
+
+    test("given an array containing non-number values, ignores them and returns the sum of the numerical elements", () => {
+        expect(sum(['hey', 10, 'hi', 60, 10])).toBe(80);
+    });
+
+    test("given an array with only non-number values, returns 0", () => {
+        expect(sum(['hey', 'hi', 'hello'])).toBe(0);
+    });
+});
\ No newline at end of file
diff --git a/Sprint-1/refactor/includes.js b/Sprint-1/refactor/includes.js
index 29dad81f0..4a23cb6d2 100644
--- a/Sprint-1/refactor/includes.js
+++ b/Sprint-1/refactor/includes.js
@@ -1,8 +1,5 @@
-// Refactor the implementation of includes to use a for...of loop
-
 function includes(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
+  for (const element of list) {
     if (element === target) {
       return true;
     }
@@ -10,4 +7,4 @@ function includes(list, target) {
   return false;
 }
 
-module.exports = includes;
+module.exports = includes;
\ No newline at end of file