Based on a census (2009) report carried in a certain community in Kenya, the population of the community was 85,000 people on January 1,2010 During that year, a total of 2,850 new people moved into that community , while 1,250 moved out to live elsewhere . A total of 3250 babies were born and 1,550 people died during that year. Calculate: a) The population of the community on January 1,2010 (3 Marks) b) The size of the population on July 1.2010 (3 Marks) c) The Crude Birth Rate and Crude Death Rate in that year. (6 Marks) d) The Rate of Natural Increase in that year. (4 Marks) c) The number of years it will take for that population to doublo its size. (4 Marks)

a) The population of the community on January 1, 2010 was 85,000 people.<br /><br />b) To calculate the size of the population on July 1, 2010, we need to consider the changes in population throughout the year:<br /><br />- Initial population on January 1, 2010: 85,000<br />- New people moved in: 2,850<br />- People moved out: 1,250<br />- Babies born: 3,250<br />- People died: 1,550<br /><br />Population on July 1, 2010 = Initial population + New arrivals - Departures + Babies born - Deaths<br />= 85,000 + 2,850 - 1,250 + 3,250 - 1,550<br />= 88,500<br /><br />c) The Crude Birth Rate (CBR) and Crude Death Rate (CDR) in that year can be calculated as follows:<br /><br />- CBR = (Number of babies born / Total population on January 1, 2010) * 1,000<br />= (3,250 / 85,000) * 1,000<br />= 38.24 (per 1,000 people)<br /><br />- CDR = (Number of deaths / Total population on January 1, 2010) * 1,000<br />= (1,550 / 85,000) * 1,000<br />= 18.24 (per 1,000 people)<br /><br />d) The Rate of Natural Increase (RNI) can be calculated as:<br /><br />RNI = CBR - CDR<br />= 38.24 - 18.24<br />= 20 (per 1,000 people)<br /><br />e) To calculate the number of years it will take for the population to double its size, we can use the Rule of 70:<br /><br />Number of years to double = 70 / RNI<br />= 70 / 20<br />= 3.5 years