Mathematics, 21.06.2021 20:30 samantha9014
A sample of 25 undergraduates reported the following dollar amounts of entertainment expenses last year:
769 691 699 730 711 765 702 718 719 712 768 688 757 695 768 735 709 758 708 693 736 700 687 772 715
Required:
a. What are the range and standard deviation?
b. Use the Empirical Rule to establish an interval which includes about 95 percent of the observations.
Answers: 1
![Interval = [666.78, 781.62]](/tpl/images/1380/6515/adf5d.png)
![Interval = [\bar x - 2*\sigma, \bar x+ 2*\sigma]](/tpl/images/1380/6515/24269.png)
![Interval = [724.2 - 2*28.71, 724.2 + 2*28.71]](/tpl/images/1380/6515/c424c.png)
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