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A question about the distribution of random numbers - PART II

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Thanks to BGM and Dragan, my problem posted under the thread " A question about the distribution of random numbers" now appears to be solved! The solution is:

f_C(a) = 
\Phi\left(\frac {\mu_A - \mu_B} {\sqrt{\sigma^2_A + \sigma^2_B}}\right)^{-1}
\Phi\left(\frac {a - \mu_B} {\sigma_B}\right)\frac {1} {\sigma_A}\phi\left(\frac {a - \mu_A} {\sigma_A}\right)

I do have an interesting continuation to the problem, however:

The solution above shows the distribution of random variable C. My question is, given any value of C, what is the expected value of A?

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