If for a variable X it is known that E(X − 1) = 3, E[X(X + 2)] = 40, calculate the mean and standard deviation of the random variable

With reference to Example 4.16, concerning Nick’s profit from his investment:
(i) Find the standard deviation of his profit.
(ii) What is the probability that Nick’s profit is within one standard deviation either way around its expected value?

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Y= X-4. 3