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9 cards from this deck
Transform, compute, then reverse to find original mean.
Add/subtract or multiply/divide all data values by same amount.
Multiply by 1.1 to account for 10% increase.
Reverse the transformation (divide or subtract) to find original mean.
Mean, median, mode are all multiplied by 3.
Multiply data by 1.2 to include the increase.
Multiply by 0.85 (which is 100% - 15%).
Mean = 2.085
57 s (transform: -50,×10 → mean70 → ÷10,+50)
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