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The following data : 2, 5, 15, 25, 20, 12, 8, 7, 6, 16, 21,17, 30, 32, 23, 40, 51, 15, 2, 9, 57, 19, 25 is grouped in the classes 0 –5, 5 –10, 10 –15 etc. Find the frequency of the class 20 –25.

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If code P is denoted by 7, X by 9, M by 5, z by 8, L by 2, T by 1, then ZLTPXM will be

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