The professor of a business statistics class wanted to find out the average amount of time per week her students spent studying for the class. she divided the students into the left, right, and center groups according to the location they sat in the class that day. one of these 3 groups was randly selected and everyone in the group was asked the average amount of time per week he/she spent studying for the class. this is an example of a sample

Cluster sample

Step-by-step explanation:

This is an example of a cluster sample. In a cluster sample, the examiner divides the population into groups (each one of these groups is called a cluster) and once the examiner has these clusters, takes one of them and recollects the data from ALL the members of that cluster. In this case, the teacher divided the class in 3 different groups and then selects one of these groups and asks the average amount of time per week he/she spent studying.

i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1