The range is defined as the difference between the largest and the smallest observations in a set of data. Symbolically, the range is given by the relation;

R = X

R = range

X

X

When the data are grouped into a frequency distribution, the range is estimated by finding the difference between the upper boundary of the highest class and the lower boundary of the lowest class. Moreover, the range cannot be computed if there are any open-end classes in the distribution.

R = X

_{m}- X_{o}R = range

X

_{m}= largest observationX

_{o}= smallest observationWhen the data are grouped into a frequency distribution, the range is estimated by finding the difference between the upper boundary of the highest class and the lower boundary of the lowest class. Moreover, the range cannot be computed if there are any open-end classes in the distribution.