Question
Find the value of 'a' in the given data if the mean of
the given data is 12. 8, 10, 15, 14, 9, 13, a, 7, 11, 12Solution
Sum of each term of given data = 10 × 12 = 120 So, 8 + 10 + 15 + 14 + 9 + 13 + a + 7 + 11 + 12 = 120 Or, 99 + a = 120 Or, 'a' = 21 Hence, option C.
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