The names and the costs (in billions of dollars) of the six costliest U.S. hurricanes are shown in Table 13.
Table 13
Costs of Six Costliest U.S. Hurricanes
Name Cost (billions of dollars)
Katrina ……………………. 105.8
Andrew ……………………. 45.6
Ike ………………………… 27.8
Wilma ……………………. 20.6
Ivan ………………………. 19.8
Charley ……………………. 15.8
Let n be the number of hurricanes listed in Table 13, and let xi be the cost (in billions of dollars) of the hurricane listed in the ith row of the table.
a. Find the values of x1, x2, x3, x4, x5, and x6.
b. Find Σxi. What does it mean in this situation?
c. Find Σxi/n. What does it mean in this situation?