yego.me
💡 Stop wasting time. Read Youtube instead of watch. Download Chrome Extension

Ordering rational numbers compared to an average | Grade 8 (TX) | Khan Academy


2m read
·Nov 10, 2024

We're told four friends completed a 5 km run. Their average time to complete the run was 24 minutes. To compare their times, they created a table that shows the difference between each person's time and the average time, with negative numbers representing times less than the average. So that's the data right over here.

Who had the fastest time? Pause this video and see if you can figure that out before we do that together.

Alright, so the person with the fastest time is going to be whoever had the lowest number or the lowest time. Now, this is all compared to the average. So, one way to think about it is whoever is going to be the most below average in terms of time is actually the fastest. Or, one way to think about it is whoever is going to be the most negative.

Now we could eyeball this right over here and say, well, anyone who is above average in terms of time is going to be below average in terms of speed. They're not going to have the fastest time. So these people are both above average in terms of time, so they're below average in terms of speed.

And then if we were to compare these two right over here, we would say, well, look, Vlad is further below average time than Bianca is. Vlad's at -2 while Bianca is at -1.5 or negative one and a half. So just looking at it, I would say that Vlad has the fastest time.

Now, there are other ways you could have done this. Oftentimes, if you're comparing numbers, it's easier to convert them all into decimals. So you might have said something like Pedro is 0.5 minutes above average in terms of time. Joselin, if you were to convert this into a decimal, is 2.75 minutes above average. Vlad is 2 minutes below average in terms of time, and Bianca is a minute and a half below average.

Then you could sort all of these. So, the slowest time is this one. Maybe I'll do it in terms of slowest. Slowest, let me do it in a different color. Well, I'll just order it this way.

The slowest is 2.75; that is Joselyn. She has the most above average time. Then next, the next slowest is 0.5; that is Pedro. And then the next slowest is going to be Bianca at -1.5, so 1.5 minutes below average. And then, last but not least, we have Vlad who is 2 minutes below average.

So, once again, when you order it this way, we see that Vlad has the fastest time and, if you want to know who is the slowest, it is Joselyn.

More Articles

View All
exposing the dark side of rent control...
What’s up you guys! It’s Graham here. So I’m gonna go on a limb and make this video, and I realize that it’s a bit of a risky topic for me to be discussing: rent control, just given the complexities of the situation. But let’s give it a shot! I’m also gon…
Mistakes when finding inflection points: second derivative undefined | AP Calculus AB | Khan Academy
Robert was asked to find where ( g(x) ), which is equal to the cube root of ( x ), has inflection points. This is his solution, and then later we are asked if Robert’s work is correct. If not, what’s his mistake? So pause this video and try to figure it o…
Watch Famous Ponies Swim in Chincoteague Island Tradition | National Geographic
[Music] There’s nothing else that I found that makes me as excited as I am to do this. You can’t ride roller coasters that give you this feeling. You can’t go other places and see anything like this. This is unique to here. We start on a Saturday. We wil…
Held at gunpoint while selling a private jet!
The first jet I ever sold in my life, I was held at gunpoint three feet away from me. It’s a long story. The first time I saw the jet, I was 23 years old. I flew to America, to North Carolina. We were signing a deal with the Venezuelan buyer. He had two …
LearnStorm 2021 - Khan Academy LearnStorm
Hello teachers, I’m Sal Khan, founder of the not-for-profit Khan Academy, and I’m here to announce a nationwide back-to-school learning challenge called LearnStorm. LearnStorm is an exciting way to jumpstart your school year around learning activities. …
Stop Buying Homes
What’s up guys, it’s Graham here! So listen, there are very few topics out there that get me upset, and most of the time, I’m just able to brush it off and move on with my day. But when I see flat-out blatant misinformation being spread throughout the int…