For the following questions you work with the built-in dataset Theoph. It contains data on the pharmacokinetics of theophylline in twelve subjects:

 

   Subject   Wt Dose  Time  conc
1        1 79.6 4.02  0.00  0.74
2        1 79.6 4.02  0.25  2.84
3        1 79.6 4.02  0.57  6.57
4        1 79.6 4.02  1.12 10.50
5        1 79.6 4.02  2.02  9.66
6        1 79.6 4.02  3.82  8.58
7        1 79.6 4.02  5.10  8.36
8        1 79.6 4.02  7.03  7.47
9        1 79.6 4.02  9.05  6.89
10       1 79.6 4.02 12.12  5.94

 

Question: Use lattice graphics to create a histogram of the overall concentrations (the variable conc). Use eight bins for binning the data. Store the graph in an object called p3.

 

Note: The command as.grob() from the ggplotify package enables Dodona to check your result. Just put your ordinary graphical command(s) between the two comments.