a. the rms error for the new scatter diagram is the same as the rms error for the old one.

b. the rms error for the new scatter diagram is greater than the rms error for the old one.

c. the rms error for the new scatter diagram is less than the rms error for the old one.

d. to know whether the rms error for the new scatter diagram is less than, greater than, or equal to the rms error for the old one you need more information about the old scatter diagram or the point added to it to get the new scatter diagram.