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Construct a frequency table for the foll...

Construct a frequency table for the following ages (in years) of `30` students using equal class intervals, one of them being `9-12`, where `12` is not included.
`18, 12, 7, 6, 11, 15, 21, 9, 8, 13, 15, 17, 22, 19, 14, 21, 23, 8, 12, 17, 15, 6, 18, 23, 22, 16, 9, 21, 11, 16`.

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`(##NTN_MATH_IX_C14_E01_009_A01##)`
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