Data Practice: Linear Interpolation Between Known Points

Data Practice: Linear Interpolation Between Known Points

Choose one exact numerical answer in the unit requested. Fractions such as 3/2 mean an exact value; no rounding unless requested. All 20 questions appear in random order. Practice target: 16/20. These are focused mathematics exercises, not a complete examination.
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For linear interpolation, y = 6 at x = 2 and y = 18 at x = 8. What is y at x = 5?