diff --git a/index.js b/index.js
index 0f4b28b4..d7fa55ea 100644
--- a/index.js
+++ b/index.js
@@ -1,17 +1,44 @@
 class SortedList {
-  constructor() {}
+  constructor() {
+    this.items=[]
+    this.length=this.items.length
+  
+  }
 
-  add(item) {}
+   add(item) {
+      let i = 0;
+      while (i < this.items.length && this.items[i] < item) i++;
+      this.items.splice(i, 0, item);
+      this.length = this.items.length;
+    }
+      
+    
 
-  get(pos) {}
 
-  max() {}
+  get(pos) {
+    if (pos < 0 || pos >= this.length) throw new Error("OutOfBounds");
+    return this.items[pos];
+  }
+max() {
+  if (this.length === 0) throw new Error("EmptySortedList");
+  return Math.max(...this.items);
+}
 
-  min() {}
+  min() {
+    if (this.length === 0) throw new Error("EmptySortedList");
+  return Math.min(...this.items);
+  }
 
-  sum() {}
+   sum() {
+    if (this.length === 0) return 0;
+    return this.items.reduce((acc, val) => acc + val, 0);
+  }
 
-  avg() {}
+  avg() {
+    if (this.length === 0) throw new Error("EmptySortedList");
+   
+    return this.items.reduce((acc, val) => acc + val, 0) / this.length;
+  }
 }
 
 module.exports = SortedList;
diff --git a/package.json b/package.json
index 3a5127ae..701007ec 100644
--- a/package.json
+++ b/package.json
@@ -19,5 +19,8 @@
     "intro"
   ],
   "author": "fer@ironhack.com",
-  "license": "MIT"
+  "license": "MIT",
+  "dependencies": {
+    "mocha": "^11.7.6"
+  }
 }