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2.)

Essentially, of these four charts, there is only one that correctly represents the data set.
For the first two: the left-most column simply represents the first digit of a two-digit number. For example, 32,35,36,39,39,30 would be grouped into 3|256990. The only difference between the two is that they sorted the second digits.

The third chart is sorting the data set into intervals, tallying off each count, then providing the number of counts.
The fourth chart is essentially a bar graph of the third.
The easiest way to approach this problem is to create a stem and leaf plot (similar to graphs ½)...

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