S1 Standard Deviation Jan 2007
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.com/download/Maths/A-level/S1/Papers-OCR/January%202007%20QP%20-%20S1%20OCR.pdf
http://files.physicsandmathstutor.com/download/Maths/A-level/S1/Papers-OCR/January%202007%20QP%20-%20S1%20OCR.pdf
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