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The weight of potato chips in a medium size bag is stated to be 250 gm. The amount that the packing machine puts in these bags is believed to be normally distributed with mean 252 gm and standard deviation 2.0 gm.

(c) Some chips are sold in "bargain packs" of 3 bags. What is the probability that at least two bags are underweight?

(d) If the mean remains at 252, what must the standard deviation be so that only 5% of bags will be underweight?

 

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