At a Certain Excavation Site, Archaeological Studies Have Used the Method

At a certain excavation site, archaeological studies have used the method of tree-ring dating in an effort to determine when people lived in there. Wood from several excavations gave a mean of (year) 899 with a standard deviation of 38 years. The distribution of dates was more or less mound-shaped and symmetrical about the mean. Use the empirical rule to estimate a range of years centered about the mean in which about 68.3% of the data (tree-ring dates) will be found.

A) from 975 to 1013
B) from 861 to 1013
C) from 899 to 1013
D) from 785 to 861
E) from 861 to 937