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A deck of cards has 4 suits and 13 denominators. A full deck contains 52 cards...

A deck of cards has 4 suits and 13 denominators. A full deck contains 52 cards A single card has three characteristics: suit, denomination and colour, for example a king of red hearts.

(a) 7 cards are drawn from 52, without replacement. Let ? be the number of ♢ 's drawn. What is the standard deviation of ?,??[?]=?

(b) 28 cards are drawn from 52, with replacement and the number of ♣'s drawn is at most 11 but at least 4, what is the probability there will be exactly 7 ♣'s drawn.

Probability: ?

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