6.11. The magnetizing force H at a point P, X units from a wire carrying a current I, is given by H21/X. (See Fig. 6.14.) Suppose that P is a variable point. That is, X is a continuous random variable uniformly distributed over (3, 5). Assume that the current I is also a continuous random vari- able, uniformly distributed over (10, 20). Suppose, in addi- tion, that the random variables X and I are independent. Find the pdf of the random variable H.