According to our research of Iowa and other state lists there were 58 registered sex offenders living in 50701 zip code as of April 10, 2017. The ratio of number of residents in zip code 50701 to the number of sex offenders is 496 to 1.
Customer survey questionnaires heavily depend on demographic questions. If your questionnaire results tell you that 65% of your respondents are Males in the 25 to 39 age group, your advertising would focus on that age and gender group as they would make up a large portion of your customer base. Your categories need to be broken up into divisions that make sense for your research.
It doesn't make any difference if there are 100 people in the group and 90% are over 50. The median age is still 50. The average age is computed by adding up all the ages of the 100 people and dividing that total by 100. If 90% of the people are over 50, the average could be 65 or more.