For the following distribution,
Class |
0 – 5 |
5 – 10 |
10 – 15 |
15 – 20 |
20 – 25 |
Frequency |
10 |
15 |
12 |
20 |
9 |
the sum of the lower limits of the median and modal class is
(a) 15 (b) 25 (c) 30 (d) 35