A baseball stadium holds 15,002 seats. The lower level has 50 fewer than three times as many seats as the upper level. The middle level has 40 more than twice as many seats as the upper level. Let x represent the number of upper-level seats. Which equation represents this scenario?
x + (2x + 20) + (3x – 50) = 15,002
x + (2x + 40) + (3x – 50) = 15,002
x + 2(20 + x) + 3(50 – x) = 15,002
x + 2(x + 20) + 3(x – 50) = 15,002

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The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

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