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Find the mean and standard deviation of a sampling

When a production process is operating? correctly, the number of units produced per hour has a normal distribution with a mean of 104 and a standard deviation of 10. A random sample of 4 hours was taken

Find the mean of the sampling distribution of the sample means
Find the variance of the sample mean
Find the standard error of the sample mean
What is the probability that the sample mean exceeds 104.8

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Basic Statistics: Find the mean and standard deviation of a sampling

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Basic Statistics: Find the mean and standard deviation of a sampling

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