Financial flows. The World Bank Group published the DEBT Report 2021 that provides an analysis of the evolving trends and development related to external debt and public debt in individual countries and regional groups. The following table shows the net financial flows in US$ (billion) for the Middle East and North Africa from 2010 to 2019.

a. Explain why the data in the table represents time series data. FINANCIAL M02_MCCL3396_14_GE_C02.indd 136 29/09/2021 13:39 Supplementary Exercises 2.139–2.172 137 Country Daily Buyers Female Buyers (%) France 1251 68 United Kingdom 792 70.7 United States 912 76.8 Germany 578 70.8 Italy 400 70.8 Summary statistics Variable N Mean StDev Min Q1 Median Q3 Max IQR Daily Buyers 30 178.17 307.51 7 16.25 40 149.25 1251 133 Female Buyers (%) 30 76.44 9.70 47.1 70.95 76.35 80.325 100 9.375

a. Locate the mean number of daily buyers from the summary statistics, and practically interpret its value.

b. Locate the median number of daily buyers from the summary statistics, and practically interpret its value.

c. Locate the mean percentage of female buyers from the summary statistics and interpret its value.

d. Locate the median percentage of female buyers on the output and interpret its value.

e. Use the information from the summary statistics to find the range of the number of buyers.

f. Locate the standard deviation of the number of buyers. g. Use the result of part f to find the variance of the number of buyers. h. If one of the top 30 countries is selected at random, give an interval that is likely to include the number of buyers.