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    Question

    If the mean of four observations is 20 and when a

    constant C is added to each observation the mean becomes 22 the value of C is –
    A -2 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 4 Correct Answer Incorrect Answer
    D 6 Correct Answer Incorrect Answer

    Solution

    => Total of four observations = 4 × 20 = 80 Total of four observations after adding C in observation = 80 + 4C => 22 = (80 + 4C)/4 => C = 2

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