Question: can i get help on this problem please ? last 2 anwsers are 7.5 and .25 min and 5.5 and .35 min A call service

can i get help on this problem please ?

last 2 anwsers are "7.5 and .25 min" and "5.5 and .35 min"

A call service center is monitoring the average length of time spent with each customer on the phone. The process is known to have an average time of 15 minutes and an average range of 4 minutes. To make sure that the process is in control, an inspector randomly selects 5 calls per day to monitor. The sample means and sample ranges for the call times have been computed in minutes and are shown below: Sample #1 Sample mean Sample Range #3 #4 What are the range-chart three-sigma upper and lower control limits? Multiple Choice .) 5.76 and 0.24 minutes 6.33 and 0 minutes 8.44 and 0 minutes

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