Zak T.

asked • 05/10/13

need help on solving stem- and- leaf- plots

ok so i need some help understanding these see the way my teacher is show how to solve them is making it very difficult to understand and i make thing so much harder so i need some to dum stem- and- leaf- plots down to where a 1st grader could understand it

Kathleen M.

Could you give me an example of a problem so that I can better understand how to answer this question? Thanks!

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05/10/13

2 Answers By Expert Tutors

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Heidi A.

Great explanation, Zoltan. I would add that if you consider what questions you can answer, the plots will begin to make more sense. If you just wanted to know min, max, and range, you could easily get that by ordering the data. This plot should make it easier to answer tougher questions than that, and it does.

For example, let's say the above plot represents a survey of coins in your pocket. "How many people surveyed have fewer than 10 coins in their pocket?" 4  "If we were to survey a lot more people, we'd expect the typical #coins to be about what?" Between 5 and 11 coins (Note there several reasonable ways to answer this one.)

The other thing to note is that you define the stem and leaf in a way to help you answer the questions you want. For example, let's say the data set is this.

a = {120, 125, 160, 220, 280, 534, 887, 910}

Your key (stem and leaf definition) could be 1 | 20 = 120 OR 12 | 0 = 120

If you want to answer questions ("analyze") based on the hundreds place, then you would use the first one: 1 | 20 = 120. If you wanted to focus on the resolution of the last digit for each stem, you may choose the second one: 12 | 0 = 120.

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05/10/13

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