2. An epidemiologie investigation begun on January 1st, 2009 identified a population of 1,000 individuals among whom 4 were found to have the disease under study on this date. During the year of the study, 6 additional new cases were found. Among the total of 10 cases, there were 6 deaths during the year. For the 10 cases, see the diagram on below that indicates the time of case recognition, periods of observation during the study, and vital status at the time of the termination of observation. An arrow at the start of the diagram (patients 1,2,3,4) indicates that the start of disease had occurred before the study began. 2009 2010 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan 1 alive 2 dead 36 dead 4_dead 5 alive 6 -dead 7 alive -dead alive 10 dead Assume that the 990 remaining individuals in the study did not become ill or die during the year of observation. From the information and diagram given, calculate the following: A. Prevalence of the disease on: i March 1, 2009 ii. October 1, 2009 iii. December 31, 2009