b) The following table shows the time spent in reading a book by a group of standard six ' students from Permsta Primary School. Time (in minutes) Number of students 30 39 25 40 49 16 50 59 12 60 69 T 70 79 5 v) The mean and variance of time to read a book by a group of students from Berlian Primary School are 43.21 and 234.? respectively. Determine which group of students is more consistent in the time spent reading a book