3. Find the arithmetic mean

Ages of \(15\) students in \(8^{th}\) standard is \(13\), \(12\), \(13\), \(14\), \(12\), \(13\), \(13\), \(14\), \(12\), \(13\), \(13\), \(14\), \(13\), \(12\), \(14\). Find the mean age of the students.