Find the standard deviation for the following data: (i) $x:$ , 3, 8, 13, 18, 23 $f:$ , 7, 10, 15, 10, 6 (ii) $x:$ , 2, 3, 4, 5, 6, 7, 7 $f:$ , 4, 9, 16, 14, 11, 6, 6

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