單項(xiàng)選擇題符號(hào)信源的概率分布為{0.5,0.3,0.2},經(jīng)過變長(zhǎng)編碼后對(duì)應(yīng)碼字分別為{1,01,001},則平均碼長(zhǎng)為()碼元/符號(hào)。

A.2
B.1.5
C.1.7
D.1.2


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