To determine the average rate of growth of the bean plant, we need to first calculate the total time taken for the plant to grow an additional 10 cm.
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Adding up the times for the four measurements: \[ 2.4 \text{ days} + 1.2 \text{ days} + 1.0 \text{ days} + 0.9 \text{ days} = 5.5 \text{ days} \]
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The average rate of growth can then be calculated by dividing the total growth (10 cm) by the total time (5.5 days): \[ \text{Average rate of growth} = \frac{10 \text{ cm}}{5.5 \text{ days}} \approx 1.818 \text{ cm/day} \]
To express this more accurately: \[ 1.818 \text{ cm/day} \approx 1.82 \text{ cm/day} \]
Thus, the average rate of growth of the bean plant is approximately 1.82 cm/day. However, none of the provided options correspond to the computed average growth rate of approximately 1.82 cm/day. Make sure to select or provide the closest acceptable answer based on the options available.