The article “E-cigarettes as a Source of Toxic and Potentially Carcinogenic Metals” (Environ. Res. 2017: 221–225) reports the concentration (μg/L) of cadmium, chromium, lead, manganese, and nickel in 10 cartidges for each of five e-cigarette brands. Here are the lead levels in the 50 cartridges (some values were estimated from a graph in the article):

Because the values are on very different scales, it makes sense to take the logarithms of these values first. Apply a log10() transformation to these values, construct a comparative boxplot, and comment on what you find.

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Brand A B C D E 500 1705 3.53 20.6 7.94 79.3 3.17 5.01 4.50 5.24 623 2190 3.67 34.0 14.3 156 3.45 5.23 4.89 6.43 794 3162 3.98 49.1 23.8 204 4.21 5.34 4.99 7.09 1228 3894 10.2 126 44.2 219 4.56 5.68 5.02 8.52 1555 4870 16.4 218 59.3 233 4.95 5.89 5.06 9.82