IF YOU ANSWER THE QUESTIONS ALL CORRECT I WILL MARK YOU BRAINIEST!
1. What is the interquartile range of the data set shown? {3,4,4,5,7,10,11,12,15}

2. What is the upper quartile of this data set? {66,66,67,69,70,72,72,73,75}

3. What is the lower quartile of the following data set? {23,23,24,27,31,33,34,38,40}