According to the 2015 revision of the UN world population projection the world population in 2100 is projected to be around ___________

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Step-by-step explanation:

1. The United Nations 2015 World Population Prospects (medium variant) projects the world population in 2100 to be approximately $11.2$ billion.

2. In scientific notation this value is $11.2	imes 10^{9} = 1.12	imes 10^{10}$, confirming the magnitude of the projection.

3. Therefore the projected world population in 2100 is $11.2$ billion, matching option (b).

FINAL_ANSWER: b

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