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Question

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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Solution

Sol:

Minimum observation is 6 and maximum observation is 23. So the range is 23-6 = 17

The classes of equal size covering the given data are: (6-9), (9-12), (12-15), (15-18),(18-21), (21-24).

Thus the frequency distribution may be given as under:

https://lh5.googleusercontent.com/wYBCrc5wmJv3nJqXVqHghapVfL3nwgecoFzHKG7gG5Oosolc_UfIxtODdlzLvMuxAjYoL_BQpHz33SI9BJNxxQJNsaiuQ4L3EYwUeItu0GeeikeGJy1x9bN2M0P7N-Y4ni5ejc9l


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