The function values at four points of are shown in the table. The area under the function, using trapezoidal method, is ______ (round off to 1 decimal place).
| x | 2 | 4 | 8 | 9 |
|---|---|---|---|---|
| f(x) | 8 | 12 | 9 | 10 |
Min: 71 Max: 72
Answer: 71.5
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