Final answer:
The margin of error is ± 0.8 and the confidence interval is centered around the sample mean of 10.5.
Step-by-step explanation:
The true statement for this data is:
a.) The margin of error is equal to ± 0.8 and the confidence interval is equal to 10.5.
The margin of error is the range within which we can expect the true population mean to fall. In this case, the margin of error is ± 0.8. The confidence interval is the range of values that we estimate the true population mean to be within. In this case, the confidence interval is centered around the sample mean of 10.5.