15.2, 11.2, 31.7, 17.1, 23.4, 15.2, 23.4, 31.7, 17.1, 23.4, 15.2, 11.2, 17.1, 31.7, 15.2, 17.1, 23.4, 17.1, 31.7 .
 
 
Mode \(=\) .