A company manufactures quartz watches. The watches have an average life of 44.3 months. The standard deviation of watch lifetimes is 11 months and the distribution of lifetimes is normal. The company guarantees a refund on any defective watch for 10 months after purchase. How long should the guarantee period be (in months) if the company does not want to make refunds on more than 26% of the watches it produces? [Round your answer to the nearest month.]

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