in the us 1 person out of every 250 is in the army and 8 out of every 10,000 are army officers find the percentage of army personnel that are officers or if this cannot be determined from the information given state the fact

I can't understand why the data is the percentage of surveyed parents.

Eye Color       Blue Brown Green/Hazel/Other Total MALE 6 20 6 32 FEMALE 4 16 12 32 TOTAL 10 36 18 64 1. What percent of females are brown-eyed?

The Census Bureau Web site gives several choices for "average income" in its historical income data. In 2006, the median income of American households was $48,201. The mean household income was $66,570. The median income of families was $58,407, and the mean family income was $77,315. The Census Bureau says, “Households consist of all people who occupy a housing unit. The term ‘family’ refers to a group of two or more people related by birth, marriage, or adoption who reside together.”   Identify the reason for mean incomes for households being higher than median incomes for households.