What is the lower quartile of the following set? 28, 45, 12, 34, 36, 45, 19, 20 28.5 19.5 19 28

To find the lower quartile take the number of terms=n=12

to find the lower quartile take the equation (n+1) / 4 = 3.25

this means that the lower quartile will be at the 3.25th position int he sequence when all the terms are ordered from smallest to largest. so when ordered: 12 19 19 19.5 20 28 28 28.5 34 36 45 45

so the lower quartile is between 19 and 19.5 exactly 19.125