The age of the population in Wakanda is shown in the following table in the form of a
grouped frequency distribution.
Age (years) Number (‘000)
0 Under 5 1 375.3
5 under 15 2 750.5
15 under 30 4 514.7
30 under 50 6 137.7
50 under 65 3 821.7
65 under 80 2 045.7
80 under 100 783.2
100 under 110 3.1
Total 21 431.8
Use the data in the table above to estimate for of population in Wakanda the:
BACHELOR OF COMMERCE YEAR 1 – ACADEMIC AND ASSESSMENT CALENDAR - DISTANCE
REGENT BUSINESS SCHOOL (RBS) – JANUARY 2021 15
3.1 median age.
Median number:
Median class
Median age:
where is lower number of median class,
is cumulative frequency of class preceding to median class,
is frequency/number of median class,
is class length.
So, median age is 36.76 years.
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