The marks of 500 candidates in an examination are normally distributed with a mean of 45 marks
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The marks of 500 candidates in an examination are normally distributed with a mean of 45 marks and a standard deviation of 20 marks.
(a) Given that the pass mark is 41, estimate the number of candidates who passed the examination.
(b) If 5% of the candidates obtain a distinction by scoring x marks or more, estimate the value of x.
(c) Estimate the interquartile range of the distribution. (L. Additional)
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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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