Every week, Mr. Park asks for 1 pound of potato salad at the deli. The line plot shows the actual weight of the salad the deli worker has given him for the past several weeks

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+

15

3

1

1

1

8

1

16

16

16

16

Weight in Pounds

What is the difference between the greatest and least weights Mr. Park received? Enter your answer

as a fraction

The difference is

pound.