Mean time required to service the model

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Reference no: EM1318322

An owner of a retail outlet sold and provided service for copying machines. One type of machine, the DW 140 model, needed service often. The owner was interested in the mean time required to service this model, and decided not to carry the model if the mean repair time appeared to be more than 40 minutes. The repairman provided the following 39 times (in minutes):

23	27	28	33	35	37	39	39	39	39	40	40	41
42	42	42	42	43	43	44	44	45	46	46	46	47
47	47	48	49	50	51	52	53	53	56	57	61	62

Reference no: EM1318322

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