Find the median and interquartile range of the top seven Dreamworks animated movies; refer to Exercise 3.42 for the data.
In exercise, the ten top-grossing DreamWorks animated movies for the U.S. box office up to July 2013 are shown in the table, in millions of dollars.
Movie $Millions
Shrek 2 ............ 441
Shrek the Third .......... 323
Shrek .............. 268
Shrek Forever After ........ 268
How to Train Your Dragon ..... 218
Madagascar 3 ......... 217
Kung Fu Panda ......... 215
Monsters vs. Aliens ........ 198
Madagascar ........... 194
The Croods .......... 186