The times (in seconds) between fifteen consecutive eruptions of a geyser were as follows:

878, 871, 906, 933, 930, 852, 890, 861, 882, 888, 897, 899, 879, 888, 848

By entering the data into R, find the following (giving answers to two decimal places):

Part a) The sample mean is (\({\rm sec}\)).

Part b) The sample variance is (\({\rm sec}^{2}\)).

Part c) The sample median is (\({\rm sec}\)).

Part d) The sample IQR is (\({\rm sec}\)).

Part e) Which of the following is a boxplot of the data?

(Click on a graph to enlarge it.)