43. The accompanying observations on stabilized viscosity

(cP) for specimens of a certain grade of asphalt with 18% rubber added are from the article Viscosity Characteristics of Rubber-Modi edAsphalts

(J. Mater. Civil Engrg., 1996: 153—156):

2781 2900 3013 2856 2888

a. What are the values of the sample mean and sample median?

b. Calculate the sample variance using the computational formula. (Hint: First subtract a convenient number from each observation.)