Accu-Rating has just released its webcast report for last month. The report details the aggregate tuning hours (ATHs) for the top20

radio stations broadcast over the web. (The ATH for a station is the sum total of all hours that listeners tuned to the station.) The report displays the following histogram:

8

6

4

2

0

Frequency

2

3

4

8

3

20040060080010001200

ATH (in thousands of hours)

Based on the histogram, find the proportion of ATHs in the sample that are less than

400

thousand hours. Write your answer as a decimal, and do not round your answer.