# Question

With reference to Example 3.22 on page 94, find the covariance of X1 and X3.

## Answer to relevant Questions

With reference to Exercise 3.74 on page 100, find cov( X, Y). If var(X1) = 5, var(X2) = 4, var(X3) = 7, cov(X1, X2) = 3, cov(X1, X3) = –2, and X2 and X3 are independent, find the covariance of Y1 = X1 – 2X2 + 3X3 and Y2 = –2X1 + 3X2 + 4X3. Referring to Example 2.28 on page 48, assume that one million people are given the test for the rare disease. Find (a) The expected number of persons given the test who have the disease; (b) The expected number of persons ...The amount of time it takes a person to be served at a given restaurant is a random variable with the probability density Find the mean and the variance of this random variable. The length of certain bricks is a random variable with a mean of 8 inches and a standard deviation of 0.1 inch, and the thickness of the mortar between two bricks is a random variable with a mean of 0.5 inch and a standard ...Post your question

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