   Chapter 14, Problem 2DA Environmental Science (MindTap Cou...

15th Edition
G. Tyler Miller + 1 other
ISBN: 9781305090446

Solutions

Chapter
Section Environmental Science (MindTap Cou...

15th Edition
G. Tyler Miller + 1 other
ISBN: 9781305090446
Textbook Problem

The graph below shows the effects of AIDS on life expectancy at birth in Botswana, 1950‒2000, and projects these effects to 2050. Study the graph and answer the questions that follow. (a) By what percentage is life expectancy in Botswana projected to increase between 2015 and 2050? (b) By what percentage was life expectancy in Botswana projected to decrease between 1995 and 2050?

To determine

The percentage of life expectancy that is projected to increase between 2015 and 2050 in Botswana. The percentage of life expectancy that is projected to decrease between 1995 and 2050 in Botswana.

Explanation

Life expectancy is the measure to expect the average time of an individual to survive. Life expectancy depends on the year in which the individual was born and its current age and other factors that can affect their survival, for example, disease such as AIDS.

Condition (a).

The given information in the graph is as follows:

The age for expectancy during 2015 = 30 years.

The age for expectancy during 2050 = 45 years.

The differences between the ages for life expectancy between 2050 and 2015 is = 45-30 = 15 years.

The formula that can be used to calculate the percentage of life expectancy is as follows:

The difference between the ages for life expectancy between 2050 and 2015The age for expectancy during 2015×100 (I)

By substituting the given values of life expectancies in equation (I), the percentage of the increased life expectancy would be:

=1530×100=50%

Therefore, the percentage of life expectancy that is projected to increase between 2015 and 2050 in Botswana is 50%

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