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A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in \(20\) houses in a locality. Find the mean number of plants per house.
| Number of Plants | \(0-2\) | \(2-4\) | \(4-6\) | \(6-8\) | \(8-10\) | \(10-12\) | \(12-14\) |
| Number of houses | \(1\) | \(2\) | \(1\) | \(5\) | \(6\) | \(2\) | \(3\) |
The Mean of the data is \(=\) .
Which method did you use for finding the mean, and why?
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