The number of people visiting the zoo during weekends is given below. If the modal class is \(15 - 30\) with mode 24, then find the missing frequency.
| Age | \(0 - 15\) | \(15 - 30\) | \(30 - 45\) | \(45 - 60\) | \(60 - 75\) |
| Number of people | 4 | 40 | \(a\) | 35 | 20 |
Answer:
The missing frequency is .