To get the percentage of citizens under 5ft total we use the formula:
(number of citizens who are under 5.5 ft)/(Total population)×100%
number of citizens who are under 5.5 ft=5,500,000
Total population=23,456,900
Hence:
Percentage of population under 5.5 ft tall
=5,500,000/23,456,900×100
=23.45%