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Answer:
Note:
Integers are whole numbers.
They include 0, negative whole numbers, and positive whole numbers
Since the condition to win the rafle is to pick an interger, let us consider the number picked by each of the students and see if it is an integer or not.
Cecily picked 6.7
This is a decimal number, it is not an integer
Marty picked -37
This is an integer, since it is not a decimal and does not have a fraction component
Jon picked 7/9
This is a proper fraction, and it is not an integer
Fiona picked 3 1/3
This is a mixed fraction, it is not an integer.
The only student that picked an integer number is Marty, hence, she is the winner of the raffle.