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From research in a certain children's hospital, it is known that 90% of newborn babies like to listen to white noise music for better sleep.

From research in a certain children's hospital, it is known that 90% of newborn babies like to listen to white noise music for better sleep. A random sample of 20 newborn babies is selected.Let the random variableXdenote the number of newborn babies who do not like to listen to white noise music. Find the mean ofX

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