Sixteen milk-yielding Ayrshire cows were fed a diet of silage that was supplemented with a vitamin con- tentrate. The following values refer to the milk fat concentration (g/kg) for each cow 20, 38, 44, 49, 42, 21, 48, 47 21, 22, 23, 26, 26, 44, 48, 29 (a) Create a stem-and-leaf display with two lines per stem. (b) What interesting feature of the data is made apparent when put into the stem-and-leaf display? (c) Calculate the mean averagel and median and explain why reporting a center for this data (mean or median) without providing a graph of the data is not very useful. 4. The back-to-back split stemplot shows the lifetimes of 15 Brand X and Brand Y batteries (number down the middle gives the stem and numbers under Brand X and Brand Y are leaves). Brand 21103 997753 3221 4 223334 456889 Key: 2141 or 2 represents 420429 bours for Brand X and Brand Y, respectively (a) What is the longest that any battery lasted? (b) Give a reason someone might prefer a Brand X battery (c) Give a reason someone might prefer a Brand Y battery