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 (sec) Part b) The sample variance is (sec2 ). Part c) The sample median is (sec ) . Part d) The sample IQR is (sec ) . Part e) Which of the following is a boxplot of the data? ? Ties between enploce in set Tmes toshereen enctors in Bee 900 650 A 820 between eruptions in sec)