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    Mean +/- Standard Deviation.

    1) 24 +/- 12
    2) 57 +/- 17
    3) 150 +/- 68
    4) 22 +/- 15

    is it 3?

    if so, then using the formula SD/ Mean * 100.

    why does option 4 give you the highest %.

    15/22 *100 gives you 68%
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    (Original post by CyberKid)
    Mean +/- Standard Deviation.

    1) 24 +/- 12
    2) 57 +/- 17
    3) 150 +/- 68
    4) 22 +/- 15

    is it 3?

    if so, then using the formula SD/ Mean * 100.

    why does option 4 give you the highest %.

    15/22 *100 gives you 68%
    Since standard deviation is a value in its own right I think the answer is number 3; although you need to consider the spread around the given mean if you're using the values in a test. Number 4 seems more variable.
 
 
 
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