What are the sample mean and margin of error?

Question

50 random flights from D.C to New York City were selected and the resulting 95% confidence interval was (82.5, 88.7). What are the sample mean and margin of error?

Answer 1

Margin of error = (88.7 - 82.5)/2

= 3.1

Sample mean = 82.5 + 3.1

= 85.6