The range is 19.2 - 1.1 = 18.1. We divide 18.1 / 5 = 3.62. This means that a class width of 4 would be appropriate. Our smallest data value is 1.1, so we start the first class at a

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And it doesn't matter which two you use as long as the one that comes right after the other. So let's just use the first two bins lower class limits 130 and 110. So if I take 130

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