The Economic Census shows the following sales (in $billions) for businesses in 20 manufacturing sectors

Manufacturing Sector                      Sales ($billions)

Food products…………………..       490.1

Tobacco products……………….       36.6

Textile mill products……………       84.0

Apparel & other textile…………       833.8

Lumber & wood products……..        115.2

Furniture & fxtures……………          62.5

Paper & allied products……….         161.2

Printing & publishing…………          216.2

Chemicals & allied products….         409.9

Petroleum & coal products……         176.7

Rubber & plastics products…...         162.7

Leather & leather products……          10.2

Stone, clay, & glass products…          88.1

Primary metal industries………         191.7

Fabricated metal products…….         235.3

Industrial machinery &……….          411.9

Electronic & other electric……          355.2

Transportation equipment…….          518.9

Instruments & related………...          157.7

Miscellaneous…………………           53.5

Identify the 1^st, 2^nd and 3^rd quartiles, and explain what each indicates.