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     EduGorilla 
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    Directions: The mean and standard deviation of 100 items are 50, 5 and that of 150 items are 40, 6 respectively.

    What is the combined standard deviation of all 250 items?

    Options :-

    1. 7.1
    2. 7.3
    3. 7.5
    4. 7.7
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Reply To: Directions: The mean and standard deviation of 100 items are 50, 5 and that of 150 items are 40, 6 r….
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