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Find the mean of the variable x assuming following values: 1) 1,2,.......n with frequency as it's values. 2) the first n natural numbers. 3) 1^2,3^2,5^2,....(2n-1)^2. 4)2,4,6,...,2n. 5)2^3,4^3,6^3,.....(2n)^3. 6)1,2,.....n with frequency 1^2,2^2,.....n^2 respectively.