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The number of people visiting the zoo during weekends is given below. If the modal class is \(15 - 30\) with mode 30, then find the missing frequency.
| Age | \(0 - 15\) | \(15 - 30\) | \(30 - 45\) | \(45 - 60\) | \(60 - 75\) |
| Number of people | 10 | 36 | \(a\) | 33 | 18 |
Answer:
The missing frequency is .
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