How do you work out the lower quartile?

To find the lower quartile of a set of data, we can find the median of the data and then find the median of the first half

You first find out the number of data is in the whole sample, then calculate as part of data what is n/4

You then look for the first n/4 data in that sample, this gives you the first or lower quartile Q(a). I hope this helps you !

Q1=1/4(n+1)the term