Which step comes last when using the divide-center method to find the trend line on a scatterplot?
Approximate the center of the cluster located on the left side of the line, and repeat for the right side of the line.
Connect the two centers to produce the trend line.
Disregard all outliers.
Draw a vertical line so that each side has the same number of data points

Option "B" is correct.

Step-by-step explanation:

When the dots have been plotted, there are three steps to find the trend line on a scatter plot:

1.  Draw a vertical line that separates the full set of points into two sets, each with the same number of dots.

2.Mark with a special sign (e.g + or ×) the middle value in each of the two sets obtained in the previous step.

3.Join the two marks mentioned in the step (2) with a straight line, and extend it to the edges of the graph. This line is the trend line, and this is the last step.

Thus, the last step when using the divide-center method to find the line on scatter plot is Connect the two centers to produce the trend line.

Hence, Option "B" is correct.