He table below gives the percent of children under five considered to be underweight. Percent of Underweight Children Number of Countries
16–21.45 24
21.45–26.9 5
26.9–32.35 10
32.35–37.8 7
37.8–43.25 6
43.25–48.7 1
What is the best estimate for the mean percentage of underweight children? (Round your answer to two decimal places.

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.