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The number of chocolate chips in an​ 18-ounce bag of chocolate chip cookies is approximately normally...

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Statistics

The number of chocolate chips in an​ 18-ounce bag of chocolatechip cookies is approximately normally distributed with mean 1252and standard deviation 129 chips. ​

(a) What is the probability that a randomly selected bagcontains between 1000 and 1400 chocolate​ chips? ​

(b) What is the probability that a randomly selected bagcontains fewer than 1100 chocolate​ chips? ​

(c) What proportion of bags contains more than 1225 chocolate​chips?

​(d) What is the percentile rank of a bag that contains 1475chocolate​ chips?

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