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The number of chocolate chips in an 18 oz bag of chocolate chip cookies is approximately normally disturbed with lean 1252 and the standard deviation

The number of chocolate chips in an 18 oz bag of chocolate chip cookies is approximately normally disturbed with lean 1252 and the standard deviation 129 chips. A) what is the probability that a randomly selected bag contains between 1000 and 1500 chocolate chips. B) what is the probability that a randomly selected bag contains fewer then 1125 chocolate chips? C) what proportion of bags contain more then 1225 chocolate chips? D) what is the percentile rank of a bag that contains 1050 chocolate chips

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