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    Question

    The mean of two samples sized 50 and 100 are 54.1 and

    50.3 respectively. The standard deviation of these sample are 8 and 7 respectively. What will be the value of combined mean and standard deviation?
    A Mean is 50 and standard deviation is 7.5 Correct Answer Incorrect Answer
    B Mean is 51.57 and standard deviation is 7.5 Correct Answer Incorrect Answer
    C Mean is 52.2 and standard deviation is 7.5 Correct Answer Incorrect Answer
    D Mean is 52.2 and standard deviation is 8 Correct Answer Incorrect Answer
    E Mean is 54.1 and standard deviation is 8 Correct Answer Incorrect Answer

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