Question: A set of data whose histogram is bell shaped yields a mean and standard deviation of 110 and 30, respectively. According to Empirical Rule, approximately

A set of data whose histogram is bell shaped yields a mean and standard deviation of 110 and 30, respectively. According to Empirical Rule, approximately what proportion of observation i) Are less than 20 ii) Are between 50 and 140 iii) Are greater than 140

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