find the size of the class interval 200-220,220-240,240-260,260-280
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For most data, 6 to 15 classes are enough. Class intervals (lengths) should be equal. Intervals such as 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50, etc are desirable.
from this eg you can solve this
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