Let x1 and x2 be independent chi-square random variables with r1 and r2 degrees of freedom, respectively. let y1 = (x1/r1)/(x2/r2) and y2 = x2. (a) find the joint pdf of y1 and y2. (b) determine the marginal pdf of y1 and show that y1 has an f distribution. (this is another, but equivalent, way of finding the pdf of f.)

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Sample response: if the graph passes the horizontaline test, then the function is one to one. functions that are one to one have inverses that a therefore, the inverse is a hinction compare your response to the sample response above. what did you include in your explanation? a reference to the horizontal-line test d a statement that the function is one-to-one the conclusion that the inverse is a function done

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm