Annual revenues (in $ millions) for Home Depot and Lowe’s Corporation are collected for 13 years. A portion of the data is shown in the accompanying table. 

a. For each company, calculate the mean and the median revenues for this time period. Which company had higher average revenues? 

b. For each company, calculate the variance and the standard deviation for this time period. Which company’s revenues had more dispersion as measured by the standard deviation?

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Year 2006 2007 I ⠀ 2018 100904 HD 77019 79022 Lowe's 43243 46927 I 68619