The dot plot below shows the hourly rate of some babysitters:

a number line is shown from 1 dollar to 7 dollars in increments of 1 dollar for each tick mark. the horizontal axis label is dollars per hour. there are 4 dots above 4 dollars, 2 dots above 5 dollars, 3 dots above 6 dollars, and 1 dot above 7 dollars. the title of the line plot is babysitting rates.

based on the data shown, how many of the babysitters surveyed earn $6 or more per hour?