Please explain and show how to solve with equations

Thirty companies comprise the DJIA. Market capitalization is computed by multiplying the number of stock shares by the price of a share of stock. The market capitalization for these thirty stocks on January 10, 2017 are contained in the file accompanying the exam.

a. Calculate the mean, median, variance and standard deviation for this data.

b. Do the data appear skewed?

c. What proportion of the data fall within 1, 2, 3 standard deviations of the mean?

d. does this data set appear to be consistent with the empirical rule?

O AutoSave OFF Home Insert Draw Page Layout Form A ~ % " Paste Font Alignment Number N20 X V fx A B C D Company Market Cap ($bil) 2 3M 100.2 3 American Express 79.5 4 Apple 724.7 5 Boeing 98.8 6 Caterpillar 52.5 7 Chevron 203.1 8 Cisco 147.5 9 CocaCola 178.5 10 Disney 188.3 11 DuPont 65.9 12 ExxonMobil 371.2 13 GE 271.2 14 Goldman Sachs 85.3 15 HomeDepot 140.3 16 IBM 170.4 17 Intel 154.8 18 Johnson & Johnson 275.9 19 JPMorgan & Chase 240.7 20 Mcdonald's 92.2 21 Merck 171.1 22 Microsoft 385.1 23 Nike 86.3 24 P &G 217.2 25 Pfizer 209.5 26 Travelers 32.6 27 United Health Group 107.9 28 United Technologies 103.7 29 Verizon 204.3 30 Visa 162.0 31 WalMart 252.0 32 33