Question: 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

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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