if the first quartile is 104 and quartile deviation is 8, the third quartile is:
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120
(3rd quartile - 1st quartile) ÷ 2 = 8
or, (3rd quartile - 1st quartile) =16
or, 3rd quartile -104 = 16
or, 3rd quartile = 16+104
or, 3rd quartile =120
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