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Mathematics, 29.08.2019 06:30, samanthadiva
Acarpenter purchased 50 ft of redwood and 90 ft of pine for a total cost of $274. a second purchase at the same prices include 80 ft of redwood and 50 ft of pine for a total cost of 335. find the cost per foot of redwood and of pine
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Answers: 3
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Mathematics, 21.06.2019 19:40, evarod
Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.
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Acarpenter purchased 50 ft of redwood and 90 ft of pine for a total cost of $274. a second purchase...
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