With reference to Exercise 2.48, calculate the quartiles.
In Exercise 2.48
A large mail-order firm employs numerous persons to- take phone orders. Computers on which orders are entered also automatically collect data on phone activity. One variable useful for planning staffing levels is the number of calls per shift handled by each employee. From the data collected on 25 workers, calls per shift were (courtesy of Land's End)

Calculate the sample mean.

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