Question

which measure is based on only the central fifty percent of the observations?
(a) standard deviation
(b) quartile deviation
(c) mean deviation
(d) all these measures​

Answer 1

Step-by-step explanation:-

b) The Quartile Deviation is a simple way to estimate the spread of a distribution about a measure of its central tendency (usually the mean). So, it gives you an idea about the range within which the central 50% of your sample data lies.