We have b 18 times 109 bits that need to be sent over a, Ask an Expert

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We have b = 18 × 109 bits that need to be sent over a channel which has a constant but random rate R bits/second with PMF: pR(r) = 1/3, if r = 3 × 109 bits/second 2/3, if r = 900 × 106 bits/second 0, otherwise.

Note that sending b bits at rate R bits/second takes T = g(R) = b/R seconds.

(a) What is the expected transmission rate E[R]?

(b) What is the expected transmission time E[T]?

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