In a metal fabrication process, metal rods are produced to a specified target length of 15 feet. Suppose that the lengths are normally distributed. A quality control specialist collects a random sample of 16 rods and finds the sample mean length to be 14.8 feet and a standard deviation of 0.65 feet. The standard error of the mean is
A 0.65 ft.
B 0.1625 ft.
C 0.0098 ft.
D 0.346 ft.
E 1.625 ft.