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Service agents in a mobile phone shop take an average of 2 0 minutes to set up a new customer contract, with a standard deviation

Service agents in a mobile phone shop take an average of 20 minutes to set up a new customer contract, with a standard deviation of 5 minutes. The upper tolerance level is set at 25 minutes and the lower tolerance level at 10 minutes. Calculate the capability ratio (C.) and the capability index (Ck) to determine if this process is in control.

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