Let X denote the number of empty bins when 60 balls are thrown inde- pendently into 30 bins. What is the expectation of X?

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Q: Let X denote the number of empty bins when 60 balls are thrown independently into 30 bins. What is…

A: Let X denote the number of empty bins. Balls are thrown independently into bins. The number of balls…

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Q: but isn't the expectation alpha times beta rather than alpha divided by beta?

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