A sample of 25 elements produced a mean of 123.4 and a standard deviation of 18.32.Assuming that the population has a normal distribution,the 90% confidence interval for the population mean,rounded to two decimal places,is:

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The Answer of A sample of 25 elements produced a mean of 123.4 and a standard deviation of 18.32.Assuming that the population has a normal distribution,the 90% confidence interval for the population mean,rounded to two decimal places,is:

A Sample of 25 Elements Produced a Mean of 123