Question: how did they get this answer : x bar = 139.2, E=13.4 3. Determine the point estimate of the population mean and margin of error

how did they get this answer : x bar = 139.2,

how did they get this answer : x bar = 139.2, E=13.4

E=13.4 3. Determine the point estimate of the population mean and margin

3. Determine the point estimate of the population mean and margin of error if the confidence interval has lower bound: 125.8 and upper bound: 152.6

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