13. You are interpreting the data in a research you conducted with the hypothesis that kids from low-income families will have lower test scores than those from middle- and upper-class families. The amount of passing grades for ten children in upper- and middle-class households look like this: 6, 6, 8, 8, 7, 6, 5, 5, 7, 9. You determine the measure of central tendency is 6. Which measurement are you utilizing?

mean

median

average

mode