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a random sample of 16 graduates of a certain secretarial school typed on average 100 WPM with standard deviation of 8WPM. Assume normal distribution of
a random sample of 16 graduates of a certain secretarial school typed on average 100 WPM with standard deviation of 8WPM. Assume normal distribution of WPM find 95% confidence interval for average number of words typed by all graduates
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