The dot plot below shows the hourly rate of some babysitters: Babysitting Rates
$1.00
$2.00
$3.00
$4.00 / ••••
$5.00/••
$6.00/•••
$7.00/•
Dollars per hour

Based on the data shown, how many of the babysitters surveyed earn $6 or more per hour?
1
4
6
10