The diameter of the Douglas fir tree is measured at a height of 1.37 meters. The following data represents the diameter in centimeters of a random sample of 12 Douglas firs in the western Washington Cascades.

156	190	147	173	159	181
162	130	101	147	113	109

Assume that the fir tree diameters came from a population that is normally distributed. Find the point estimate for the mean and standard deviation of a Douglas fir tree in the western Washington Cascades.