Question: The data set has 80 observations and has mean 30 and standard deviation 5. Approximately how many observations lie between 20 and 40? The quantitative

The data set has 80 observations and has mean 30 and standard deviation 5. Approximately how many observations lie between 20 and 40?

The quantitative data set under consideration has roughly a bell-shaped distribution. Apply the empirical rule to solve.

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