Airfare 178.02 241.29 249.48 251.20 256.38 261.28 263.21 263.35 263.63 265.19 273.20 273.67 279.06 282.15 286.19 289.04 289.25 292.33 294.09 295.30...

3. Excel File AverageAirfare contains the average domestic airfare* for the top 100 U.S. airports (based on 2009 originating domestic passengers) for the second quarter of 2010. Use class widths of $25 so that the first class is 175 < X <= 200; the second is 200 < X <= 225; the third is 225 < X <= 250; continuing as high as needed to include all the data. Averages do not include frequent-flyer or “zero fares” or a few abnormally high reported fares. b. Construct a histogram and percentage distribution polygon.c. Describe the shape of the distribution of average airfares. Does it appear to be “approximately normally distributed”?