diff --git a/src/studentmean.ts b/src/studentmean.ts
new file mode 100644
index 0000000..94477d4
--- /dev/null
+++ b/src/studentmean.ts
@@ -0,0 +1,26 @@
+type StudentGrade = {name: string, grade: number};
+
+const notes = [70, 80, 75, 60, 65, 45, 90];
+const students = ['tao', 'kia', 'kim', 'sue', 'kim', 'kac', 'avi']
+
+function createStudentGrade(grades: number[], names: string[]): StudentGrade[]{
+    let ret: StudentGrade[] = [];
+    for(let i = 0; i < grades.length; i++){
+        ret.push({name: names[i], grade: grades[i]})
+    }
+    return ret;
+}
+
+function averageGrade(studentGrades: StudentGrade[]): number{
+    let sum = 0;
+    for(const studentGrade of  studentGrades){
+        const note = studentGrade.grade;
+        sum += note;
+    }
+    return sum / studentGrades.length;
+}
+
+let studentGrades = createStudentGrade(notes, students);
+let average = averageGrade(studentGrades);
+console.log(average)
+