A student investigated the rate of transpiration in a green plant. The plant was growing in soil in a pot. The student watered the plant and then put a plastic bag around the pot, leaving the leaves of the plant outside the bag. She measured the mass of the plant in the pot at the start and repeated this every two hours for six hours. [Figure 10.1] The results of the investigation are shown. [Table 10.1] What is the mean rate of transpiration over the six-hour period?

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