Visualization #$4$: Automobile horsepower $($horizontal axis$)$ by different number of cylinders $(4,6,$ or $8).$

Hint: The yellow line indicates the median, whereas the grey lines projected to the horizontal axis indicates the mean For each of the $8$ visualizations, please try to answer the following questions $($unless otherwise noted$)$:

$(1)$ What type of chart$/$plot is it$?$ In what situation$($s$)$ would such chart$/$plot be the most appropriate$/$useful$?$

$(2)$ What can you see$/$learn from the chart$/$plot$?$ Please make sure you state an observation even when it is obvious.

$(3)$ What business decision$($s$)$ may be sensible based on the chart$/$plot$?$ Why? If you do not believe the chart$/$plot implies any actions, explain the reason$($s$).$

$(4)$ How would you have improved the visualization $($to make it more clear or more informative$)?$