Students investigate how to extract DNA from kiwi fruit. They compare extracting DNA at room temperature (20∘C20^\circ\text{C}20∘C) versus using a warm water bath (50∘C50^\circ\text{C}50∘C). The table below shows the mass of DNA collected by the students in three trials (tests) for each method: \ | Extraction temperature | Mass of DNA (mg): Test 1 | Mass of DNA (mg): Test 2 | Mass of DNA (mg): Test 3 | Mean mass (mg) | | :--- | :---: | :---: | :---: | :---: | | 20∘C20^\circ\text{C}20∘C | 18.4 | 19.1 | 17.9 | 18.5 | | 50∘C50^\circ\text{C}50∘C | 29.1 | 27.1 | 27.9 | [ ? ] | \
Calculate the mean mass of DNA collected for the extraction at 50∘C50^\circ\text{C}50∘C. Give your answer to 1 decimal place.
The range of the three test readings for the extraction at 20∘C20^\circ\text{C}20∘C is 1.2 mg1.2\text{ mg}1.2 mg. Does the evidence support using a warm water bath (50∘C50^\circ\text{C}50∘C) instead of room temperature (20∘C20^\circ\text{C}20∘C)? Explain your answer using calculations of range and mean.