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Find the mean age of \(100\) residents of a town from the following data:
| Age | Number of persons |
| \(\text{equal and above } 0\) | \(100\) |
| \(\text{equal and above }10\) | \(90\) |
| \(\text{equal and above } 20\) | \(75\) |
| \(\text{equal and above } 30\) | \(50\) |
| \(\text{equal and above } 40\) | \(25\) |
| \(\text{equal and above } 50\) | \(15\) |
| \(\text{equal and above } 60\) | \(5\) |
| \(\text{equal and above } 70\) | \(0\) |
Answer:
The mean is .
[Note: Enter the answer in to two decimal number.]
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