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10 cards from this deck
Applying a consistent operation to all dataset values.
All averages change in the same way as data values.
Transformed values: 0.05, 0.02, 0.14.
Mean = 8.5 (sum = 51, count = 6, 51/6 = 8.5)
Multiply by 1.2 for a 20% increase.
New mean = £38.80 × 1.2 = £46.56.
Add 10 back to the final result.
Multiply by 1.15 for a 15% increase.
It simplifies calculations significantly.
Forgetting to reverse the transformation.
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