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.