Quartiles | Lower Quartile, Median, and Upper Quartile | Math with Mr. J

Welcome to Quartiles with Mr. J! Need help with finding the lower quartile, median, and upper quartile? You're in the right place!
Whether you're just starting out, or need a quick refresher, this is the video for you if you're looking for help with quartiles. Mr. J will go through quartiles examples (both odd and even sets of data) and explain the steps of how to find the lower quartile, median, and upper quartile.
About Math with Mr. J: This channel offers instructional videos that are directly aligned with math standards. Teachers, parents/guardians, and students from around the world have used this channel to help with math content in many different ways. All material is absolutely free.
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Hopefully this video is what you're looking for when it comes to finding quartiles.

[@MathwithMrJ]

✅ Thanks so much for watching! Check out the information below to learn more about quartiles and some important details that were not covered in the video...
✅ With an odd set of data, you can either include or exclude the median from the lower and upper half of the data. In this video, I used the exclusive method. This means that the median is excluded from the lower and upper half of the data when finding the lower and upper quartile (this means that I excluded the median 8 from the lower and upper half). The other method is called the inclusive method. This means that you include the median in both the lower and upper half when finding the lower and upper quartile. For example, the halves would look as follows with the inclusive method (lower = 1,2,4,7,8 and upper = 8,8,10,14,15). Both methods can be used, but each will give a slightly different result.
✅ Something I’d like to mention about even sets of data is that the lower and upper half can be odd. This is different from the video where the lower and upper half were both made up of four numbers, so each half was even. Here is an example of an even set of data, but each half will be odd:
(1 , 1 , 2 , 3 , 6 , 7 , 7 , 8 , 9 , 12)
There are ten numbers in that data set. That means that the lower and upper half will be five numbers each. In that case, you will have a number directly in the middle for your lower and upper quartile. For this example the median = 6.5 (in between 6 and 7), the lower quartile = 2, and the upper quartile = 8.

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Can you pls do Measurements of position next? The grouped of decile, Percentile, and Quartile. I have a test this week 😢

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Why, in the case of journal ranking, does Q1 represent the journals with the highest impact factors rather than the lowest?

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What if there is a frequency given for data set

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Hi sir is that a ungroup data?

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SIR CAN YOU CORRECT SOMETHING FOR ME ? THE 25TH PERCENTILE OF THE DATA 16 16 17 21 28 31 39 39 IS 16.25 NOT 16.5?

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What to do when it's become fraction

[@julienbrouillet5079]

It s false because with an even number n of data, the median is (n+1)/2 and will be an k,5 where k is a n integer. Howver, to find a quartile, it will be (k,5+1)/2 which will equal to k,75 or k,25.

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