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From the following frequency distribution, find a) 7 th Deciles b) Quartile deviation Classes 120-129 130-139 140-149 150-159 160-169 170-179 180-189 f 4 17 28

From the following frequency distribution, find a) 7 th Deciles b) Quartile deviation Classes 120-129 130-139 140-149 150-159 160-169 170-179 180-189 f 4 17 28 25 18 13 6

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