Consider a manufacturing process that is known to produce Air Fryers that have life lengths with a standard deviation of 85 days. A potential customer will decide to purchase air fryers from the manufacturer if he or she is convinced that the average life of the air fryer is 1600 days. To this end, a random sample of 50 air fryers is taken from a large pool of these air fryers, and the sample yields an average life of 1585 days. Is there sufficient statistical evidence to show that the air fryers in fact have less than 1600 functional days?

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