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Answer variants:
12
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Determine the value of "\(a\)"if the mean of the following data is 15
| Class interval | \(5 - 10\) | \(10 - 15\) | \(15 - 20\) | \(20 - 25\) | \(25 - 30\) | \(30 - 35\) |
| Frequency | 80 | 60 | 50 | \(a\) | 30 | 10 |
The value of the variable is
(Note: If the answer is a whole number, write as it is. If not, round off the answer to \(2\) decimal places and submit the answer.)
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