The ten top-grossing DreamWorks animated movies for the U.S. box office up to July 2013 are shown

Question:

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
a. Find and interpret the median box office dollars for the ten top-grossing DreamWorks animated movies.
b. Find and interpret the interquartile range for these movies.