Quartiles

Key Notes:

  • The lower quartile is the median of the lower half of the data.

Learn with an example

📗 In the data set below, what is the lower quartile?
36 43 51 53 56 62 65 70 70 84 99_______

  • Divide the numbers into a lower half and an upper half.
  • 36 43 51 53 56 62 65 70 70 84 99
  • Find the lower quartile in the middle of the lower half.
  • 36 43 51 53 56
  • The lower quartile is 51.

📗 In the data set below, what is the lower quartile?
5 6 6 7 7 9 9 9 9 9____

  • Divide the numbers into a lower half and an upper half.
  • 5 6 6 7 7 9 9 9 9 9
  • Find the lower quartile in the middle of the lower half.
  • 5 6 6 7 7
  • The lower quartile is 6.

📗 In the data set below, what is the lower quartile?
2 3 5 5 5 7 7 7 7 8____

  • Divide the numbers into a lower half and an upper half.
  • 2 3 5 5 5 7 7 7 7 8
  • Find the lower quartile in the middle of the lower half.
  • 2 3 5 5 5
  • The lower quartile is 5.

Let’s practice!🖊️