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Mathematics, 10.07.2019 08:40 60129
Joan can type 50 letters in three hours. when jill , they can do the job in one hour. how long would it have taken jill to do the job alone?
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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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Joan can type 50 letters in three hours. when jill , they can do the job in one hour. how long would...
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