The six most popular cosmetic surgeries and the numbers (in thousands) of those surgeries performed in 2013

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The six most popular cosmetic surgeries and the numbers (in thousands) of those surgeries performed in 2013 are shown in Table 12.
Table 12
Numbers of Cosmetic Surgeries Performed in 2013
Procedure Frequency (thousands)
Breast Augmentation ………………. 290
Nose Reshaping ……………………. 221
Eyelid Surgery ……………………… 216
Liposuction ………………………… 200
Facelift ……………………………… 133
Tummy Tuck ………………. ……….. 112
Let n be the number of types of procedures listed in Table 12, and let xi be the number of surgeries (in thousands) in 2013 for the procedure 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?
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