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Need help with this IR question from GMAT prep software

Data Sufficiency, Multi-Source Reasoning, Table Analysis, Graphics Interpretation, Two-Part Analysis
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Source: — Data Insights |
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by kyuhunl » Tue Jan 29, 2019 4:30 am
Isn't it TTF? The number of unlimited lanes sure looks like it has a negative correlation with the average customer age. The three stores with the oldest customers don't have any and the more unlimited lanes you have, the younger the average customer.
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by bglade » Thu Feb 07, 2019 5:27 am
It is TFF. If you re-arrange the order of Self-Check Unlimited Lanes by Customer Age from youngest to oldest, you get the following:

CA - SCUL
28.40 - 6
29.90 - 8
32.00 - 4
34.50 - 4
34.60 - 6
38.73 - 3.56
38.80 - 0
42.50 - 4
50.50 - 0
56.70 - 0

As you see, there is an up-down-up-down-up-down pattern. If you eliminated the ages 29.90, 34.60, and 42.50 then there would be a negative correlation.
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