Shown in the table below are the assets (in $billions) for 10 large companies that recently fled

Question:

Shown in the table below are the assets (in $billions) for 10 large companies that recently fled for bankruptcy. Determine the range, MAD, standard deviation, and variance for the assets listed.
Companyassets
MF Global Holdings......40.5
AMR Corp...........25.1
Dynegy Holdings....... 9.9
PMI Group........... 4.2
NewPage Corp........ 3.5
Integra Bank Corp........ 2.4
General Maritime Corp....... 1.8
Borders Group......... 1.3
TerreStar Corp......... 1.4
Seahawk Drilling........ 0.6