Shown in right column are the top 10 companies receiving the largest dollar volume of contract awards from the U.S. Department of Defense in a recent year. Use this population data to compute a mean and a standard deviation for these top 10 companies.

Amount of Contracts

Company ($ billions)

Lockheed Martin .........27.32

Boeing .............20.86

Northrop Grumman ........16.77

General Dynamics ........11.47

Raytheon .............10.41

KBR .............. 5.97

L-3 Communications ....... 5.04

United Technologies ....... 4.57

BAE Systems ........... 4.50

SAIC ............... 3.40