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A certain type of TV glass is manufactured with a mean thickness of 10 millimeter and a standard deviation of 0.6 millimeter. (a) Find the

A certain type of TV glass is manufactured with a mean thickness of 10 millimeter and a standard deviation of 0.6 millimeter. (a) Find the sample mean and sample variance for a random sample with size of 36.

(b) If the sample size is 25, what is the sample mean and sample variance? (c) Find the probability that the average thickness of the sample in (a) will be less than 9.8.

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