Question
Find the value of 'a' in the given data if the mean of
the given data is 25. 12, 20, 30, 28, 26, 22, a, 24, 18, 30Solution
Sum of each term of given data = 10 × 25 = 250 So, 12 + 20 + 30 + 28 + 26 + 22 + a + 24 + 18 + 30 = 250 Or, 210 + a = 250 Or, 'a' = 40 Hence, option A.
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