A company bought 20 000 shirts on the model Bitsiani. Quality control assurance of received goods is carried out using a random sample size of 400 shirts, in which were found 380 shirts without the defect. Find the confidence interval with confidence coefficient =0.90 for the probability:
If the selling price of a not defective shirt is 750 denars and defective shirt is sold with a 50% discount, find the range of the expected loss from receiving this delivery of goods.

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