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A geometric sequence has first term u1=34, fifth term u5=121, and common ratio r>0.
Find the value of r.
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The following table shows the probability distribution of a random variable X.
Find k, giving your answer as a fraction.
Hence determine E(X).
A random variable Y, defined by Y=aX+3, has Var(Y)=3937.
Given that E(Y)=10, find the standard deviation σX of X.
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