STATS HELP!! Below are monthly rents paid by 30 students who live off campus:
640 640 640 840 610 500
600 940 650 530 630 595
470 650 560 570 760 830
510 530 670 600 620 410
640 710 730 750 630 655
Mean 637
Median 635
Mode 640
Standard Deviation 112.52

What is the z-score for a rent value of $750?
Are there unusual data values?
Using the Empirical Rule, do you think the data could be from a normal population?