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  • - [Instructor] We're told that the weights

  • of 11 different babies are recorded on the line plot below

  • and we see there is one, two, three, four,

  • five, six, seven, eight, nine,

  • 10, 11 data points.

  • Each one represents a different baby

  • whose weight is recorded.

  • Each weight was rounded to the nearest 1/8 of a pound.

  • All right, then they ask us,

  • what is the difference, in weight,

  • between the two heaviest babies?

  • So pause this video

  • and try to figure that out

  • before we work through it together.

  • All right, now where are the two heaviest babies?

  • So this one out here,

  • this is the heaviest baby,

  • and what is its weight?

  • Well, let's see.

  • Its weight is right over there,

  • and what is that number or what is that weight?

  • So this is nine and this is 10,

  • and we have one, two, three, four,

  • five, six, seven, eight equal spaces.

  • So each of these is an eighth.

  • So this is nine and one, two,

  • nine and 2/8.

  • So this one is, let me write this.

  • This is nine and 2/8.

  • Another way to think about it is,

  • 2/8 is the same thing as 1/4,

  • 'cause if you think about it,

  • it's one, two, three, four equal spaces.

  • This is also nine and 1/4 of the way to 10,

  • so this is the same thing as nine and 1/4.

  • And then what's the second heaviest babies?

  • 'Cause we want the weight difference

  • between the two heaviest.

  • So the second heaviest baby is right over here

  • and we know that it is eight and a half pounds.

  • So what we really need to do is figure out

  • what is the difference between nine and 2/8

  • or nine and 1/4

  • and eight and a half right over here?

  • So we could set this up as a subtraction.

  • This is going to be nine and,

  • let's call it nine and 1/4,

  • minus, minus eight and a half,

  • and we can actually use this,

  • this, these measurement scales

  • or you can even view this as something

  • of a number line

  • to help us think about this.

  • The difference is this length right over here.

  • And we could think about it in terms of eighths,

  • 'cause each of these hash marks is an eighth,

  • so 1/8, 2/8, 3/8, 4/8, 5/8 and 6/8.

  • So this is equal to 6/8.

  • We could also think about it in terms of fourths,

  • so this is 1/4, 2/4, and 3/4.

  • So this is equal to 3/4.

  • So what's the difference in weight

  • between the two heaviest babies?

  • It is 3/4 of a pound.

- [Instructor] We're told that the weights

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A2 heaviest weight difference equal eighth pound

Interpreting line plots

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    林宜悉 posted on 2020/04/06
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