a Use the relations in Section 19 4 for continuous variables to
(a) Use the relations in Section 19.4 for continuous variables to determine the expected value and variance for the distribution of DM in Problem 19.10.
f (DM) = 3(1 – DM)2 0 ≤ DM ≤ 1
(b) Determine the probability that DM is within 2 standard deviations of the expected value. Use the relation in Problem.

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