2.69 Infant mortality Africa The Human Development Report 2006, published by the United Nations, showed infant mortality rates (number of infant deaths per 1000 live births)

by country. For Africa, some of the values reported were:

South Africa 54, Sudan 63, Ghana 68, Madagascar 76, Senegal 78, Zimbabwe 79, Uganda 80, Congo 81, Botswana 84, Kenya 96, Nigeria 101, Malawi 110, Mali 121, Angola 154.

a. Find the first quartile (Q1) and the third quartile (Q3).

b. Find the interquartile range (IQR). Interpret it.