19. In the ordered data: 20, a, 25, 30, 40, b, 49. If the first quartile=23.5 and IQR=19, then the values of a and b are: (2 Points) O a=21,5 , b=45.5 O a=21, b=48 O = a=22, b=45 O a=22.5 , b=45.5