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Suppose that the weights of cinder blocks at a local construction yard follow a normal distribution with mean of 20 kg and a variance of 0.25 kg2.

(a) What is the probability that a cinder block weighs at most 20.6 kg?

(b) What is the probability that a cinder block weighs more than 19.8 kg?

(d) Find the weight, wU, that will be exceeded by 5% of cinder blocks.

(e) Find the weight, wL, that will be exceeded by 99% of cinder blocks.

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Statistics and Probability, Statistics

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