3cm, 7 cm, 7 cm, 7 cm, 9 cm, 11 cm, 12 cm
what is the median of the data set?

7 cm

Explanation:

since their is an odd amount of number the middle number is the median.

7 numbers means the 4th number is the middle

one of the main advantages of attending a large university is that you can often save money. smaller colleges are often private and charge higher tuition rates. a large public university can easily have 25,000 students or more taking classes on that campus. that higher number of students keep tuition costs down.