2.6 More Billionaires in 2007 The world has gotten used to having less. But there's one thing the world is getting more of these days, and that's more billionaires. According to the Forbes magazine's editors, the top 20 fortunes when combined would top the half trillion dollar mark.

a. Draw a stem and leaf plot for the wealth. Comment on the shape of the data.

b. Calculate the mean wealth for these 20 billionaires. Calculate the median wealth.

c. Which of the two measures in part b best describes the centre of the data? Explain.

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Name Age Nationality Wealth in Billions (S) Bill Gates 51 American 56 W. Buffett 76 American 52 Carlos Slim Hel 67 Mexican 49 Ingvar Kamprad 80 Swedish 33 Lakshmi Mittal 56 Indian 32 Sheldon Adelson 73 American 26 Bernard Arnault 58 French 26 Amancio Ortega 71 Spanish 24 Li Ka-shing 78 Hong Kong 23 David Thomson 49 Canadian 22 Lawrence Ellison 62 American 21.5 Liliane Bettencourt 84 French 20.7 Talal Alsaud 50 Saudi 20.3 Mukesh Ambani 49 Indian 20.1 Karl Albrecht 87 German 20 Roman Abramovich 40 Russian 18.7 Stefan Persson 59 Swedish 18.4 Anil Ambani 47 Indian 18.2 Paul Allen 54 American 18 Theo Albrecht 84 German 17.5