For a sample from a normal distribution with standard deviation ,the standard deviation of the sampling distribution of the sample mean is /3.What is the size of the sample?

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For a sample from a normal distribution with standard deviation  ,the standard deviation of the sampling distribution of the sample mean is  /3.What is the size of the sample?

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The Answer of For a sample from a normal distribution with standard deviation  ,the standard deviation of the sampling distribution of the sample mean is  /3.What is the size of the sample?

For a Sample from a Normal Distribution with Standard Deviation