The 95 Confidence Interval for the weights in pounds of a sp

The 95% Confidence Interval for the weights (in pounds) of a special type of rock has found to be 2.62, 6.8. What will be the margin of error? (Hint: Sample mean +/- margin of error = confidence interval)

95% Confidence Interval for the weights (in pounds) of a special type of rock has found to be 2.62, 6.8
Margin of error = (Upper - Lower) /2 = (6.8 - 2.62)/2 = 2.09