[請問] 期望值小問題
http://m.imgur.com/jKMt57Y
請問第一題E(X) 我怎麼算都是57.1
為什麼答案是58！！！！
求解....
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04/14 22:29, , 1F
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04/14 22:31, , 2F
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04/14 22:31, , 3F
04/14 22:31, 3F
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04/14 22:32, , 4F
04/14 22:32, 4F
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04/14 22:32, , 5F
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04/14 22:45, , 6F
04/14 22:45, 6F