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    Question

    Find the value of 'a' in the given data if the mean of

    the given data is 18. 12, 15, 20, 17, 19, 14, 21, a, 13, 16
    A 31 Correct Answer Incorrect Answer
    B 32 Correct Answer Incorrect Answer
    C 33 Correct Answer Incorrect Answer
    D 34 Correct Answer Incorrect Answer

    Solution

    Sum of each term of given data = 10 × 18 = 180 So, 12 + 15 + 20 + 17 + 19 + 14 + 21 + a + 13 + 16 = 180 Or, 147 + a = 180 Or, 'a' = 33 Hence, option C.

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