Business Statistics

Chapter 4 | Measures of Dispersion 121

Solution Table 4.3 exhibits class interval and frequencis

tabLe 4.3

Class interval and frequencies for Example 4.3

x f

10–60 3

60–120 5

120–180 6

180–240 3

240–300 2

As discussed above, range can be obtained by subtracting the lower limit of the

lowest class interval from the upper limit of the highest class interval.

Upper limit of the highest class interval L = 300

Lower limit of the lowest class interval S = 10

Range (R) = L – S = 300 – 10 = 290

Coefcient of range

−

=

+

L S

L S

290

310

=

= 0.93

So, range = 290 and coefcient of range = 0.93

4.4.2 Using MS Excel for Range Computation

MS Excel Data Analysis dialog ...