91. . . . . . . . . is used when you have variables that form rows instead of columns.
92. What is ggplot2 an implementation of?
93. Point out the correct statement?
94. . . . . . . . . divides the time spend in each function by the total run time
95. R comes with a . . . . . . . . to help you optimize your code and improve its performance.
96. . . . . . . . . generate random Normal variates with a given mean and standard deviation.
97. Which of the following draws nothing?
98. Which of the following cuts numeric vector into intervals of equal length?
99. For barchart and . . . . . . . . non-trivial methods exist for tables and arrays, documented at barchart.table.
100. Which of the following functions is typically used to add elements to a plot in the base graphics system?
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