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The random variable x is the number of occurrences of an event over an interval of 10 minutes

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The random variable x is the number of occurrences of an event over an interval of 10 minutes. It can be assumed the probability of an occurrence is the same in any two time periods of an equal length. It is known that the mean number of occurrences in 10 minutes is 5.3.

The expected value of the random variable x is _____.