It is known that that the median divides the range into half.
And the first and third quartiles are the landmark for 25% and 75% of the data values.
Therefore, a dot plot is divided into 4 parts, each of ehich represents 25% of the population.
In the given dot plot diagram, it is observed that the mean of the construction worker's salary, coincide with the upper quartile of the salary., at $45,000
It means that 50% population of construction workers is getting at most $45,000 while 75% population of teachers is getting at most $45,000.
So if a construction worker is making the median salary i.e. $45,000, so he/she will be making more than 75% of the teachers.