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    Question

    Mean and Standard deviation of 100 observation is 50 and

    10 respectively. What will be the new mean and Standard deviation if each observation is multiplied by 3?
    A 53 and 13 Correct Answer Incorrect Answer
    B 53 and 10 Correct Answer Incorrect Answer
    C 150 and 30 Correct Answer Incorrect Answer
    D 150 and 10 Correct Answer Incorrect Answer
    E 50 and 30 Correct Answer Incorrect Answer

    Solution

    Both mean and SD are affected by change in scale New Mean = 50*3 = 150 New SD = 10*3 = 30

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