The table below gives the percent of children under five considered to be underweight. Percent of Underweight Children Number of Countries
16–21.45 21
21.45–26.9 4
26.9–32.35 9
32.35–37.8 8
37.8–43.25 7
43.25–48.7 2
What is the best estimate for the mean percentage of underweight children? (Round your answer to two decimal places.)