The following sample data give the times (in minutes) that all 1010 students took to complete their assigned tasks in a statistics class.

13,15,16,18,21,26,29,31,36,3913,15,16,18,21,26,29,31,36,39

(a) Determine the mean and the standard deviation of the sample data.

(b) Calculate Q1, Q2, Q3, and IQR for this sample data.

(c) Determine the percentage of observations in the data set that fall within two standard deviations of the sample mean.

(d) Are there any outliers? Explain why or why not.