照這麽說20-30球間一定是25個?40-50個球之間是49個?101-110之間不存在這樣的等概率事件?何況這樣的方程右邊解決了,左邊怎麽辦?
照這麽說20-30球間一定是25個?40-50個球之間是49個?101-110之間不存在這樣的等概率事件?何況這樣的方程右邊解決了,左邊怎麽辦?
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