The dot plot below shows the hourly rate of some babysitters in a city: Which statement best describes the shape of the data?
a. It is symmetric and has no gaps.
b. It is not symmetric and has a peak at $7.00.
c. It is a cluster from $1.00 to $7.00 and has no gaps.
d. It is a cluster from $1.00 to $7.00 and has a peak at $6.00.