1. Refer to the "Tornadoes" data set, which you can find on the Data Sets page.

• The 'F scale' is the Fujita scale for rating tornadoes based on wind speed, where 0 is a tornado whose wind speed is less than 73 mph; 1 is a tornado whose wind speed is 73-112 mph; up through 5, which is a tornado whose wind speed is 261-318 mph. Some tornadoes did not have a value of F scale recorded, though; an entry of -9 means the F scale was not reported for that tornado.
• The 'length' is how far across the ground the tornado moved, measured in miles.

(This problem is intended to be tackled using technology. There are over a thousand tornadoes to look at.)

a. Construct a frequency table and relative frequency table of the values of the F scale, including the value of -9.

b. Create a relative frequency bar graph of the F scale.

c. Which state had the most tornadoes in 2017? Explain how you could figure this out using the data set and technology.

d. Construct a relative frequency histogram of the length of all the tornadoes, using a lower class limit of 0 and a class width of 5.

e. What is the relative frequency of tornadoes between 5 and 9.999 miles in length?