Question

The class intervals of a grouped data are as follows : 3 − 12 , 13 − 22 , 23 − 32 … The class size is
a) 9 b) 10 c) 12 d) None​

Answer 1

The class size of an interval is max value - min value of the interval

12 -3 = 9; 22 -13 = 9 etc

The answer is 9