Please calculate the quartiles of this data set.

He has a strong sense of self-affirmation and always maintains a positive attitude.

He was able to achieve career success and fame after much hardship.

He slipped out of the meeting quietly.

The teacher imparted knowledge to the students.

The dentist extracted my decayed tooth.

I gargle every night before going to bed.

Plants of this kind are collectively referred to as 'cacti'.

I enjoyed a picnic in the woods.

He gathered brushwood to keep warm.