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Joseph measures the ropes used to tie boats to a dock. He records the lengths of the ropes in feet and then makes a line plot.

Line plot named as ALTDCRope Lengths at DockALTDC shows a number line from 9 to 13. The number line is divided into 8 equal parts. 1 dot on 9.5, 1 dot on 10, 2 dots on 10.5, 3 dots on 11, 2 dots on 11.5 and 1 dot on 12 is given.

Joseph concludes that the difference between the longest and shortest lengths is 212 feet.
Marta disagrees and says that the difference is only 1 foot. Who is correct?
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