Question: A statistics practitioner determined that the mean and standard deviation of a data set were 120 and 30, respectively. What can you say about the

A statistics practitioner determined that the mean and standard deviation of a data set were 120 and 30, respectively. What can you say about the proportions of observations that lie between each of the following intervals?
a. 90 and 150
b. 60 and 180
c. 30 and 210

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