What is the average number of hookups reported by those who have hooked up?

What is the average number of hookups reported by those who have hooked up?

• A. 10.8
• B. 8.0
• C. 5.5
• D. 12.2

Answer: (A)

The main idea is to find the mean number of hookups within the group that has actually hooked up, not including those who never hooked up. You compute this by summing all hookups reported by people who have at least one hookup and dividing by how many people are in that group. This gives the central tendency for that subset. In this case, the average for those who have hooked up is 10.8, which fits as the typical level for the subgroup. The other options would imply a lower or higher central tendency than what the data show for people who have had at least one hookup.

The main idea is to find the mean number of hookups within the group that has actually hooked up, not including those who never hooked up. You compute this by summing all hookups reported by people who have at least one hookup and dividing by how many people are in that group. This gives the central tendency for that subset.

In this case, the average for those who have hooked up is 10.8, which fits as the typical level for the subgroup. The other options would imply a lower or higher central tendency than what the data show for people who have had at least one hookup.