# Question: A statistics practitioner determined that the mean and standard deviation

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

a. 90 and 150

b. 60 and 180

c. 30 and 210

**View Solution:**## Answer to relevant Questions

There has been much media coverage of the high cost of medicinal drugs in the United States. One concern is the large variation from pharmacy to pharmacy. To investigate, a consumer advocacy group took a random sample of 100 ...Everyone is familiar with waiting lines or queues. For example, people wait in line at a supermarket to go through the checkout counter. There are two factors that determine how long the queue becomes. One is the speed of ...For many restaurants, the amount of time customers linger over coffee and dessert negatively affects profits. To learn more about this variable, a sample of 200 restaurant groups was observed, and the amount of time ...Respondents were asked to report the number of minutes spent watching news on television during a typical day (TIME2).a. Calculate the mean and standard deviation.b. Draw a histogram.c. Use the Empirical rule, if applicable, ...Draw a box plot of the ages (AGE) of respondents in the 2008 survey.Post your question