The quantitative data set under consideration has roughly a​ bell-shaped distribution. Apply the empirical rule to answer the following question.   A quantitative data set has mean 18 and standard deviation 1. Approximately what percentage of the observations lie between 17 and 19​?     Approximately enter your response here​% of the observations lie between 17 and 19. ​(Type an integer or a decimal. Round to one decimal place as​ needed.)

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