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For any alevels math doubts

D

dramione

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can anyone help me with this?

May/June 2003 question 1

a fair coin is tossed 5 times and the number of heads is recorded.
i) the random variable x is the number of heads. state the mean and variance of x.
ii) the number of heads is doubled and denoted by the random variable y. state the mean and variance of y.
 
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