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On any given day, mail gets delivered by either Alice or Bob. If Alice delivers it, which happens with probability1/4, she does so at a

On any given day, mail gets delivered by either Alice or Bob. If Alice delivers it, which happens with probability1/4, she does so at a time that is uniformly distributed between9and11. If Bob delivers it, which happens with probability3/4, he does so at a time that is uniformly distributed between10and12. The PDF of the timeXthat mail gets delivered satisfies

fx(9.5) = ?

fx(10.5) = ?

.

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