Las temperaturas , en ° c , registradas durante el mes de septiembre han sido : 18, 19, 22, 16, 21, 20, 19, 18, 17, 22, 21, 23, 25, 19, 20, 22, 21, 20, 24, 23, 2119, 4, 23, 19, 18, 19, 20, 21, 19?

Las temperaturas , en ° c , registradas durante el mes de septiembre han sido : 18, 19, 22, 16, 21, 20, 19, 18, 17, 22, 21, 23, 25, 19, 20, 22, 21, 20, 24, 23, 2119, 4, 23, 19, 18, 19, 20, 21, 19. Halla la temperatura media del mes.