diff --git a/Maths/MeanAbsoluteDeviation.js b/Maths/MeanAbsoluteDeviation.js
new file mode 100644
index 0000000000..14248dd482
--- /dev/null
+++ b/Maths/MeanAbsoluteDeviation.js
@@ -0,0 +1,23 @@
+import { mean } from './AverageMean.js'
+/**
+ *@function meanAbsoluteDeviation
+ *@description Calculates the mean absolute deviation of list of numbers
+ * @param {Integer} data
+ * @returns meanAbsoluteDeviation([2,34,5,0,-2]) = 10.480
+ * @url https://en.wikipedia.org/wiki/Average_absolute_deviation
+ */
+function meanAbsoluteDeviation (data) {
+ if (!Array.isArray(data)) {
+ throw new TypeError('Invalid Input')
+ }
+ let absoluteSum = 0
+ const meanValue = mean(data)
+ for (const dataPoint of data) {
+ absoluteSum += Math.abs(dataPoint - meanValue)
+ }
+ return absoluteSum / data.length
+}
+
+export {
+ meanAbsoluteDeviation
+}
diff --git a/Maths/test/MeanAbsoluteDeviation.test.js b/Maths/test/MeanAbsoluteDeviation.test.js
new file mode 100644
index 0000000000..33fa38d2f6
--- /dev/null
+++ b/Maths/test/MeanAbsoluteDeviation.test.js
@@ -0,0 +1,16 @@
+import { meanAbsoluteDeviation } from '../MeanAbsoluteDeviation.js'
+
+describe('tests for mean absolute deviation', () => {
+ it('should be a function', () => {
+ expect(typeof meanAbsoluteDeviation).toEqual('function')
+ })
+
+ it('should throw an invalid input error', () => {
+ expect(() => meanAbsoluteDeviation('fgh')).toThrow()
+ })
+
+ it('should return the mean absolute devition of an array of numbers', () => {
+ const meanAbDev = meanAbsoluteDeviation([2, 34, 5, 0, -2])
+ expect(meanAbDev).toBe(10.479999999999999)
+ })
+})
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