A series of four measurements of the mass, length, and diameter of a cylinder are made by a student. The results of these measurements are: Mass, M (g) Length, L (cm) Diameter, D (cm) Density, p (g/cm3) 20.6 2.68 1.11 20.4 2.67 1.07 20.8 2.65 1.06 19.9 2.61 1.08 What are (a) the standard deviation of the density, and (b) the standard error of the density? Please express your answer in three significant figures