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1.5 Assign the numbers 2 through 5 to different variables, then use the vari- ables to multiply all the values. 1.6 The rivers data set is loaded when R is. View the data by typing its name and then the return key. What is the last value listed? 1.7 The exec. pay (UsingR) data set is available from the command line after loading the package UsingR. Load the package, and inspect the data set. Scan the values to find the largest one. 1.8 For the exec. pay (UsingR) data set, apply the functions mean, min, and max. What are the values found? 1.9 The basic mean function has an additional argument trim. When given, the specified proportion of the data is trimmed from the sorted data be- fore the mean is taken. Compare the difference between mean(exec. pay) and mean (exec. pay, trim=0. 10). 1.10 The Orange data set is stored as a data frame with three variables. What are the three variables? 1.11 Compute the average age of the trees in the Orange data set using mean. 1.12 Compute the largest circumference of the trees in the Orange data set