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S1 Standard Deviation Jan 2007 Watch

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    Can someone help me with q8 on jan 2007 S1 OCR Maths. I dont get how you work out the standard deviation I got 4 not 2.4 as my standard deviation can someone please show their entire working thanks

    http://files.physicsandmathstutor.co...20S1%20OCR.pdf
 
 
 
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