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From the random sample of 100 cones of vanilla i
From the random sample of 100 cones of vanilla ice-cream, it is found that 6 of them have to be disposed because of air bubbles caused by non-uniform flow of ice-cream from the dispensing machine. The disposed ice-cream cones are considered defective. Perform an estimate on the proportion of defective ice-cream cones using a 95% confidence level.