24.0, 24.3, 25.9, 18.9, 27.5, 17.9, 21.8, 20.9, 16.7 , 27.3 18.2, 24.7, 20.0, 22.6, 23.9, 18.0, 31.4, 22.3, 24.0, 25.5 24.7, 24.6, 28.1, 24.9, 22.6, 23.6, 23.4, 25.7, 24.8, 25.5 what is the population mean? what is the population variance? what is the population standard deviation