The table below gives the percent of children under five considered to be underweight.
| Percent of Underweight Children | Number of Countries |
|---|---|
| 16.1-21.5 | 21 |
| 21.6-25.9 | 7 |
| 26.0-30.3 | 7 |
| 30.4-35.7 | 3 |
| 35.8-37.3 | 3 |
| 37.4-42.5 | 3 |
| 42.6-48.7 | 2 |
- What is the best estimate for the mean percentage of underweight children? (Round your answer to two decimal places.)
- What is the standard deviation? (Round your answer to two decimal places.)
- Which interval(s) could be considered unusual? Explain.
- None of the intervals could be considered unusual since none of them contain any values in the range of ±2 standard deviations from the mean.
- The intervals 37.4-42.5 and 42.6-48.7 could be considered unusually high since they contain values that are at least two standard deviations above the mean percentage of underweight children.
- The interval 26.0-30.3 could be considered unusually high since it contains values that are at least two standard deviations above the mean percentage of underweight children.
- The interval 16.1-21.5 could be considered unusually low since it contains values that are at least two standard deviations below the mean percentage of underweight children.
