(3 points) The times (in seconds) between fifteen consecutive eruptions of a geyser were as follows: 854, 884, 904, 921, 869, 888, 847, 911, 856, 934, 861, 897, 929, 911, 830 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 (sec?). 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? ? v\f