Given data: 3.481, 3.448, 3.485, 3.475, 3.472, 3.477, 3.472, 3.464, 3.472, 3.470, 3.470, 3.470, 3.477, 3.473, 3.474
Sample mean (x̄) = (3.481 + 3.448 + 3.485 + 3.475 + 3.472 + 3.477 + 3.472 + 3.464 + 3.472 + 3.470 + 3.470 + 3.470 + 3.477 + 3.473 + 3.474) / 15 ≈
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