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Assume that the time of delivery of a parcel within a city follows a normal distribution....

Assume that the time of delivery of a parcel within a city follows a normal distribution. The following is the time taken (in hours) for the delivery of 8 parcels within a city: 28, 32, 20, 26, 42, 40, 28, and 30. Use these figures to judge the reasonableness of delivery services when they say it takes 30 hours on average to deliver a parcel within the city

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