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it is known that the weight of liquid that the machine fills into a bottle is normally distributed with a known mean and standard deviation

it is known that the weight of liquid that the machine fills into a bottle is normally distributed with a known mean and standard deviation of 1.From the production of the filling machine on given day, a simple random sample of 9 bottles are filled.What is the probability that the sample mean is closer than 0.3 from the real mean?

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