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A Population Has a Normal Distribution with a Mean of 51.4

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A population has a normal distribution with a mean of 51.4 and a standard deviation of 8.4.Assuming A population has a normal distribution with a mean of 51.4 and a standard deviation of 8.4.Assuming ,the probability,rounded to four decimal places,that the sample mean of a sample of size 18 elements selected from this populations will be more than 51.15 is: ,the probability,rounded to four decimal places,that the sample mean of a sample of size 18 elements selected from this populations will be more than 51.15 is:

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