Frequency Polygon. In Exercises, construct the frequency polygon.

Earthquake Depths Use the frequency distribution from Exercise to construct a frequency polygon. Applying a strict interpretation of the requirements for a normal distribution, do the depths appear to be normally distributed? Why or why not?

Exercise

Braking Distance Data Set 14 in Appendix B lists braking distances (ft) of different cars, and the braking distances of three of those cars are shown in the accompanying illustration.

Solution 20BSC

The depths (km) do not appear to be normal, since the frequencies start from frequency 7, and then increase to a high frequency 21 then decrease to 4, then again increase to a frequency 12 and then decrease to 6.