Two discs are drawn, without replacement, from a box containing three red discs and four white discs.
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Two discs are drawn, without replacement, from a box containing three red discs and four white discs. The discs are drawn at random. If X is the random variable 'the number of red discs drawn', find
(a) the expected number of red discs,
(b) the standard deviation of X.
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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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