Wednesday, October 29, 2003

How to separate into lower and upper quartiles?

These are my 10 numbers: 2899, 5535, 5683, 6369, 6593, 6805, 7153, 7434, 7954, 8257 . I need to separate into 4 groups.

Answer on How to separate into lower and upper quartiles?

2899, 5535, 5683, 6369, 6593, 6805, 7153, 7434, 7954, 8257

First check the numbers are in ascending order ... they are so nothing to do there

Now find the median ... there are 10 numbers so the median lies between number 5 and number 6

the lower quartile is like the median of the lower half ... (the median of the first five numbers in this case) ...

the median of the lower half is the third number ... 5683

so the lower quartile is 5683


the upper quartile is like the median of the upper half ... and that's the 8th number in the list ... 7434

so the upper quartile is 7434