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The number of chocolate chips in an18-ounce bag of chocolate chip cookies is approximately normally distributed with mean 1252 and standard deviation 129 chips. (a)

The number of chocolate chips in an18-ounce bag of chocolate chip cookies is approximately normally distributed with mean 1252 and standard deviation 129 chips.

(a) What is the probability that a randomly selected bag contains between 1000 and 1400 chocolatechips?

(b) What is the probability that a randomly selected bag contains fewer than 1025 chocolatechips?

(c) What proportion of bags contains more than 1225 chocolatechips?

(d) What is the percentile rank of a bag that contains 1050 chocolatechips?

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