CoCo S. A. is concerned at the time taken to react to customer complaints and have implemented a new set of procedures for its support centre staff . The customer service director plans to reduce the mean time for responding to customer complaints to 28 days and has collected the sample data given in Table 4.12 after implementation of the new procedures to assess the time to react to complaints (days).

(a) Estimate the mean time to react to customer complaints.

(b) Calculate the probability that the mean time to react is not greater than 28 days.

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|| || || 20 40 32 15 31 28 32 Table 4.12 33 33 50 33 35 22 34 33 20 36 27 19 26 39 29 39 31 29 39 42 39 NONA N 24 32 38 43 22 30 32 30 37 29 33 21 17 38