The mean and standard deviation of six observations are 8 and 4
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    Multiple Choice QuestionsLong Answer Type

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    546. Find variance for the following data:
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    547. From the data given below, state which group is more variable.

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    548. Find the mean and variance for the following data by shortcut method:
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    549. The mean and standard deviation of six observations are 8 and 4 respectively. If each obervation is multiplied by 3, find the new mean and new standard deviation of the resulting observations.

    Solution not provided.
    Ans. 24 ; 12

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    550. Calculate co-efficient of variation from the following data:
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