The weight of a certain type of brick has an expectation
Chapter 2, Problem 2.6.6(choose chapter or problem)
The weight of a certain type of brick has an expectation of 1.12 kg with a standard deviation of 0.03 kg. (a) What are the expectation and variance of the average weight of 25 bricks randomly selected? (b) How many bricks need to be selected so that their average weight has a standard deviation of no more than 0.005 kg?
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