7.2a Range

Measures of Dispersion (Part 1)
7.2a Range
(A) Range of Ungrouped Data



Example 1:
Find the range for the set of data 2, 4, 7, 10, 13, 16 and 18.

Solution:
Range = largest value – smallest value
   = 18 – 2
   = 16


(B) Range of Grouped Data (with Class Interval)



Example 2:
The grouped frequency distribution was obtained from 100 students regarding the scores in their test shown as below.


Find the range of the data.

Solution:
Range =midpoint of the highest class midpoint of the lowest class Range= 35+39 2 5+9 2    =377    =30

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