Using the NCBIRTH800mod dataset, answer the following questions (see Week 2 SPSS exercise, last page):

1. What was the average mother's age in this sample? Round your answer to 2 significant figures (e.g. 20.23).
2. What percentage of mothers in the sample was married? Round your answer to 1 significant figures (e.g. 17.1).
3. What was the most common race/ethnicity in the sample? Write NHW for Non-Hispanic White, NHB for Non-Hispanic Black, H for Hispanic and O for Other.