diff --git a/src/average_median/.gitkeep b/src/average_median/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/src/average_median/average_median.c b/src/average_median/average_median.c
new file mode 100644
index 0000000..8fb03c8
--- /dev/null
+++ b/src/average_median/average_median.c
@@ -0,0 +1,20 @@
+#include "average_median.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+double average(const double *data, int n) {
+    double sum = 0.0;
+    for (int i = 0; i < n; ++i) {
+        sum += data[i];
+    }
+    return sum / n;
+}
+
+double median(double *data, int n) {
+    if (n % 2 == 0) {
+        return (data[n / 2 - 1] + data[n / 2]) / 2.0;
+    } else {
+        return data[n / 2];
+    }
+}
diff --git a/src/average_median/average_median.h b/src/average_median/average_median.h
new file mode 100644
index 0000000..b9d773f
--- /dev/null
+++ b/src/average_median/average_median.h
@@ -0,0 +1,9 @@
+#ifndef average_median_H
+#define average_median_H
+
+double average(const double *data, int n);
+double median(double *data, int n);
+
+#endif
+
+
diff --git a/test/average_median/.gitkeep b/test/average_median/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/test/average_median/test_average_median.c b/test/average_median/test_average_median.c
new file mode 100644
index 0000000..8cd5e65
--- /dev/null
+++ b/test/average_median/test_average_median.c
@@ -0,0 +1,16 @@
+#include "unity.h"
+#include "average_median.h"
+
+void setUp(void){}
+
+void tearDown(void){}
+
+void test_average() {
+    double data[] = {1.0, 2.0, 3.0, 4.0, 5.0};
+    TEST_ASSERT_EQUAL_DOUBLE(3.0, mean(data, 5));
+}
+
+void test_median() {
+    double data[] = {1.0, 2.0, 3.0, 4.0, 5.0};
+    TEST_ASSERT_EQUAL_DOUBLE(3.0, median(data, 5));
+}