Arsenic is toxic to humans, and people can be exposed to it through contaminated drinking water, food, dust, and soil. Scientists have devised an interesting new way to measure a person's level of arsenic poisoning: by examining toenail clippings. In a recent study in US, scientists measured the level of arsenic (in ppm) in toenail clippings of 19 people with private wells in New Hampshire. The following levels were recorded (the data are also available in Toenail Arsenic):

0.1190.1180.0990.1180.2750.3580.0800.1580.3100.105

0.730.8320.5170.8510.2690.4330.1410.1350.175

1. Find thez-scoreof the largest concentration.
2. Find the five-number summary.
3. What is the range?
4. What is the IQR?