II. The booming economy of the 1990s created many new billionaires.
The 1999
Forbes 400
ranked the 400 wealthiest people in the United States.
The top 15
billionaires on this list are shown below:
Name
Age
Net Worth ($ millions)
Gates, William H. III
Allen, Paul Gardner
Buffett, Warren Edward
Ballmer, Steven Anthony
Dell, Michael
Walton, Jim C.
Walton, Helen R.
Walton, Alice L.
Walton, John T.
Walton, S. Robson
Moore, Gordon Earl
Ellison, Lawrence Joseph
Anschutz, Philip F.
Kluge, John Werner
Anthony, Barbara Cox
43
40
69
43
34
51
80
50
53
55
70
55
59
85
76
85,000
40,000
31,000
23,000
20,000
17,300
17,000
16,900
16,800
16,600
15,000
13,000
11,000
11,000
9,700
Source:
Forbes
, Oct. 11, 1999, p. 414
1. Find the median age
2. Here are the sample statistics calculated by Minitab.
Variable
N
Mean
Median
TrMean
StDev
SE Mean
Age
15
57.53
55.00
57.23
15.37
3.97
Variable
Minimum
Maximum
Q1
Q3
Age
34.00
85.00
43.00
70.00
a) Are there any outliers in this data? Explain your answer, showing any
calculations.
b) Use the given values and your answer above to construct a boxplot for
the ages.