<prompt> In crude death rate the population is taken as on -1st March1st July1st April15th August  <response>: A rate comprises the following elements i Numeratorii Denominatoriii Time specification iv MultiplierNumerator Refers to the number of times an event e.g. sickness, birth, death has occurred in a population, during a specified time period. Numerator is a component of the denominator in calculating a rate, but not in a ratio.Denominator Denominator may be :-i Related to populationMid year population population estimated on first of July of an yearPopulation at riskPerson - timePerson distanceii Related to total events As in case fatality rate, denominator is total number of cases rather than total population. 