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Mathematics 8 Online
OpenStudy (anonymous):

I need help on this question, The January daily high temperatures in Rockland, Me., USA is considered the most variable in the world. A random sample of 40 January daily highs were selected from data of the last 30 years. The values ranged from a low of -19.4 °C to a high of -3°C. What class width would be useful?

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