The marks in an examination were found to be normally distributed. 10% of the candidates were awarded
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The marks in an examination were found to be normally distributed. 10% of the candidates were awarded a distinction for obtaining over 75. 20% of the candidates failed the examination with a mark of under 40. Find the mean and standard deviation of the distribution of marks.
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Related Book For 
A Concise Course In Advanced Level Statistics With Worked Examples
ISBN: 9780748754755
4th Edition
Authors: J. Crawshaw, J. Chambers
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