the class marcks of clanc interval 10_ 20 is 15
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Answer. = 15. The class mark of the overlapping class interval 11 – 20 (when the intervals are 1 – 10, 11 – 20, 21 – 30, etc.)
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YES THE ANSWER IS 15 .THE CLASS MARK OF THE OVERLAPPING CLASS INTERVAL 11-20. WHEN THE INTERVALS ARE 1-10 11-20 21-30 ETC.
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