89 1213 16 17 20-21 24 25 28 29 32 33 36 37 COUNTIES YIELD-PER-ACRE GROUPS.IN BUSHELS

U S. Dcparttiwnt of Acriculturc, Burrau of Acricultural Economics.

SCALE .8

Distribution of 2,412 Counties in the United States Into Wheat Yield-per-acre Groups.

This shovwT the three steps in securing a frequency curve.

GRAPHIC PRESENTATION

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HUMDRCDS OF CARS

MAY JUNE JULY AUG. SEPT. OCT.

Rrtlrawn from n Chart liy Biirrnu of AKririiltural Economic*. U. S. IDcpt. of ARriculturc. Average Weekly Carload Shipments of Peaches in the United States by States.

1. The average is of the years 1927-19.^0.

2. The copy from which this was redrawn was a photostat, and it was redrawn because

the base lines of some of the charts were wavy. After the chart was finished, it was found that there was a definite optical illusion. When the chart is viewed from a distance, notice that the base lines seem to hump at the point where the bars arc the highest.

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FREQUENCY CHARTS

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^ 30

16-17 - ytort o» og« am-

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18-19 I

ftOfi of 09« ■

20-21 yeort o( oge '

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■ ■ ■ I

22-24 yeors of oqe '

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JLJL-M.

htow 1-3 4-5 6 7 8 9 10 Grode school and high school

OPEN COUNTRY - Grode completed

2 3 College

16-17 years of oge

6-17 ■

rs of oge ■

zidtulxx^

18-19 20 [- yeors of oge

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20-21 years of oge