Question: a. For f(x1, x2, x3) as given in Example 5.10, compute the joint marginal density function of X1 and X3 alone (by integrating over x2).

a. For f(x1, x2, x3) as given in Example 5.10, compute the joint marginal density function of X1 and X3 alone (by integrating over x2).
b. What is the probability that rocks of types 1 and 3 together make up at most 50% of the sample?
c. Compute the marginal pdf of X1 alone.

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