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a) A random sample of n = 100 frames of 100mm x 50mm was selected from a consignment of 500 frames. When their depth was

a)A random sample of n = 100 frames of 100mm x 50mm was selected from a consignment of 500 frames. When their depth was measured it was found that the mean was 106mm and standard deviation was 3.5mm. Construct a 90% confidence interval estimate of the mean depth of all the frame in the entire consignment.

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