question_answer

The median of the following observations having frequency distribution of 50, is 35. If the median class is \[30-40,\] then the value of a and b is _______.

Class Interval	Frequency	Class Interval	Frequency
0 ? 10	3	30 ? 40	10
10 ? 20	a	40 ? 50	b
20 ? 30	15	50 ? 60	5

A)  a = 2, b = 15

B)  a = 4, b = 17

C)  a = 6, b = 19  

D)  a = 8, b = 21

E)  None of these