Mathematics (AS & A Level) · May / June 2018 · Paper 72 · Question 2

The random variable X has the distribution N3, 1.2 . The random variable A is defined by A = 2X. The random variable B is defined by B = X1 + X2, where X1 and X2 are independent random values of X. Describe fully the distribution of A and the distribution of B. [3] Distribution of A: Distribution of B:

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