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A student was trying to determine how many ice cubes would be needed to keep a glass containing 250 mL of water under 15°C for a minimum of 30 minutes. The student placed varying numbers of ice cubes in different cups and recorded the time it took for the water to warm up to 15°C. The student then performed the same experiment each day for a week. Why did the student perform multiple trials of the same experiment? pls help