Construct the frequency distribution table for the data on heights (cm)
of 20 boys using the class intervals 130 - 135, 135 - 140 and so on.
The heights of the boys in cm are: 140, 138, 133, 148, 160, 153, 131,
146, 134, 136, 149, 141, 155, 149, 165, 142, 144, 147, 138, 139.

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