diff --git a/Interview-Preparation-Kit/Sorting/fraudulent-activity-notifications.js b/Interview-Preparation-Kit/Sorting/fraudulent-activity-notifications.js
new file mode 100644
index 0000000..f9e00a2
--- /dev/null
+++ b/Interview-Preparation-Kit/Sorting/fraudulent-activity-notifications.js
@@ -0,0 +1,69 @@
+/**
+ * @title Fraudulent Activity Notifications
+ * @difficulty Median
+ * @link https://www.hackerrank.com/challenges/fraudulent-activity-notifications/problem
+ */
+
+const findValueAtIndex = (countSorted, findIndex) => {
+  let curPosition = 0;
+  let foundValue = 0;
+  for (const num in countSorted) {
+    if (countSorted.hasOwnProperty(num)) {
+      curPosition += countSorted[num];
+      if (curPosition > findIndex) {
+        foundValue = num;
+        break;
+      }
+    }
+  }
+
+  return parseInt(foundValue, 10);
+};
+
+const findMedian = (sortedArr, length) => {
+  let median = findValueAtIndex(sortedArr, parseInt(length / 2, 10));
+  median = (length % 2 === 0) ?
+    median + findValueAtIndex(sortedArr, parseInt(length / 2, 10) - 1) :
+    median * 2;
+
+  return median;
+};
+
+const computeOverSpend = ({countSorted, recentExpenditure, numOverSpend}, spend, index, restExpenditure) => {
+  const {length: restDays} = restExpenditure;
+  const {length: recordDays} = recentExpenditure;
+
+  const median = findMedian(countSorted, recordDays);
+
+  if (spend >= median) {
+    numOverSpend++;
+  }
+
+  countSorted[recentExpenditure.shift()]--;
+  recentExpenditure.push(spend);
+  countSorted[spend] = (countSorted[spend] || 0) + 1;
+
+  return {countSorted,
+    recentExpenditure,
+    numOverSpend};
+};
+
+function activityNotifications(expenditure, d) {
+  const initState = {
+    'countSorted': {},
+    'recentExpenditure': 0,
+    'numOverSpend': 0
+  };
+
+  initState.recentExpenditure = expenditure.slice(0, d);
+  initState.countSorted = initState.recentExpenditure.reduce((countSorted, value) => {
+    countSorted[value] = (countSorted[value] || 0) + 1;
+
+    return countSorted;
+  }, {});
+
+  const restExpenditure = expenditure.splice(d);
+  const {numOverSpend} = restExpenditure.reduce(computeOverSpend, initState);
+
+  return numOverSpend;
+}
diff --git a/README.md b/README.md
index e1e1f85..778f396 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,13 @@ Generates the README.md.
 | --- | --- | --- |
 | Easy | [2D Array - DS](https://www.hackerrank.com/challenges/2d-array/problem) | [Solution](./Interview-Preparation-Kit/Arrays/2d-array-ds.js)|
 | Easy | [Left Rotation](https://www.hackerrank.com/challenges/ctci-array-left-rotation/problem) | [Solution](./Interview-Preparation-Kit/Arrays/left-rotation.js)|
+#### Sorting
+| Difficulty | Problem | Solution |
+| --- | --- | --- |
+| Median | [Fraudulent Activity Notifications](https://www.hackerrank.com/challenges/fraudulent-activity-notifications/problem) | [Solution](./Interview-Preparation-Kit/Sorting/fraudulent-activity-notifications.js)|
+#### Strings
+| Difficulty | Problem | Solution |
+| --- | --- | --- |
 #### Warm-up-Challenges
 | Difficulty | Problem | Solution |
 | --- | --- | --- |