The University of North Carolina is conducting a study on the average weight of the many bricks that make up the University’s walkways. Workers are sent to dig up and weigh a sample of 421 bricks and the average brick weight of this sample was 14.2 lb. It is a well-known fact that the standard deviation of brick weight is 0.8 lb.

1. Find the standard error of the mean.
2. What is the interval around the sample mean that will include the population mean 95.5 percent of the time?

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