Find and interpret the mean absolute deviation of the data. Round your answer to the nearest tenth, if necessary.

The mean absolute deviation is

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Question 2

The prices differ from the by an average of $.

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Will gve pints stars and brainliest

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.