Use the F-scale measurements from the tornadoes listed in Data Set 22 ?Tornadoes? in Appendix B. Among the 500 tornadoes, how many have missing F-scale measurements? (Caution: In some technologies, missing data are represented by a constant such as -9 or 9999.)

Refer to the indicated data set in Appendix B. Use software or a calculator to find the means and medians.

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WIDTH (YD) YEAR LENGTH (MI) MONTH F SCALE FATALITIES 1950 3.60 100 1950 4 34.30 150 0.20 1950 6 10 1950 10 0.10 1951 6. 10 0.10