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Current time:0:00Total duration:5:05

Video transcript

let's get a little practice doing the Khan Academy exercise marking data on line plots so right over here it says Tessa measure the distance from her house to several locations to the nearest half kilometer all right and so they have different locations and it tells her the it tells us the distance from her house to each of these locations so from our house to the school is three and a half kilometres to the library is five and a half kilometres to the park is two kilometres it's a movie theater four kilometres to the post office five and a half kilometres and then they ask us how many dots should be on a line plot of these measurements so a line plot and they have one down here a line plot this is literally a number line and what we do is we put as many dots there are at a certain at a certain point in the line so if we have two data points at five and a half we would put two dots right over there but we'll get to that in a second but we're just asking is how many dots should be on a line plot of these measurements well we should make a dot for each of these data points and there are one two three four five data points here so there's five data points that I'm going to want to put on my line plot then they say click a create a line plot that shows all of the measurements click above the marking on the number line that matches each measurement click higher to add more dots above the same marking click lower to add fewer dots so they say that the distance from the school to Tess's house is three and a half kilometers so we would want to put a dot at three and a half and I do that just by clicking clicking right over there three and a half so that's one data point at three and a half halfway between three and four let's do it for the next one's five-and-a-half that's the distance from the library to our house five-and-a-half then we have two kilometers two kilometers distance from two kilometers was the distance from the park to our house then the movie theater is four kilometers I wish you could see it all in one screen four kilometers and then the post office is also five and half kilometer so you actually have two data points at five and a half kilometers so right here I've just constructed a line plot at different points on the number line I'm showing how many data points we have so we have one data point at two kilometers one at three and a half kilometers one at four kilometers and two at five and a half kilometers and notice we said five data we said we would have five dots when we have one two three four five one for each data point let's do this one more time let's check make sure we got it right now let's do one more all right measure the length measure the length of each line to the nearest quarter inch to the collect data for the line plot below to make your measurements drag the ruler on top of the lines align the left end of the ruler with the left end of the lines then read of the length of each line from the right end of the line all right so really I just want to measure I just want to measure oh this is I didn't need to tilt it like that I just want to measure each of these lines so this green line right over here looks like it is six and this is put into one two three four and it looks like it's 6 and 3/4 6 and 3/4 the Green Line is 6 and 3/4 inches long so we have one data point at 6 and 3/4 so I'll put that right over there then we have the red line is let's see this is 7 and 2/4 or 7 and 1/2 halfway between 7 and 8 so 7 and 2/4 or 7 and 1/2 so halfway between 7 and 8 is right over there and then finally I have the purple line the purple line let's see that is 8 and 3/4 inches long notice I aligned it right at the beginning right over there and it goes all the way to 8 and 1/2 3 out of the 4 8 and 3/4 inches long so let me 8 and 3/4 so there you go I have one line that was 6 and 3/4 it's one line that was 7 and 2/4 or 7 and 1/2 and then one line that's 8 and 3/4 inches let's check our answer let's do one more this is actually a lot of fun all right we got to measure things again so let's see the Green Line Green Line is exactly three inches long three inches long so let's plot it right over there then we have the red line is exactly let's see 3 and 3/4 inches long 3 and 3/4 so let's put a dot right over there and then the purple line is 3 inches long as well so I have another data point at 3 inches of to it so two of the lines were three inches and one of them is 3 and 3/4 and we are and we're done