Percent of children under five considered to be underweight. Percent of Underweight Children Number of Countries 16–21.45 23 21.45–26.9 4 26.9–32.35 9 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? What is the standard deviation? ( consider this sample data ( not population data ) Consider that unusual values are typically more than 2 standard deviations ( ±2sx ) from the mean. Therefore, which interval(s) could be considered unusual? Explain.