Mathematics (AS & A Level) · Oct / Nov 2016 · Paper 73 · Question 8
9709
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The question as text
z −3 0 3 Z y −3 0 3 Y x −3 0 3 X w −3 0 3 W The diagrams show the probability density functions of four random variables W, X, Y and Z. Each of the four variables takes values between −3 and 3 only, and their standard deviations are 3W, 3X, 3Y and 3Z respectively.
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8(i)[2]
8(ii)[7]
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