Final answer:
The mortality rate is calculated by dividing the number of deaths by the population at risk and then multiplying by 1000 to express it per thousand. Specific data on deaths and the population affected in the outbreak are necessary to provide the exact rate. Without these figures, we cannot determine the approximate mortality rate for the outbreak.
Step-by-step explanation:
Calculating the mortality rate for an outbreak involves determining the ratio of deaths to the population at risk and then expressing it as a proportion per thousand, hundred, or another convenient denominator. The example given indicates that if between ages three and four, 12 individuals die out of the 776 remaining from the original 1,000, this number is multiplied by 1000 to get the mortality rate per thousand. Therefore, the mortality rate is calculated as:
mortality rate = (12 / 776) x 1000 ≈ 15.5 per thousand.
Given the figures, to answer the student's question, we need specific numbers regarding the number of deaths and the population at risk. Without these numbers, it's impossible to provide the approximate mortality rate from the given options. More detailed data from the outbreak or the specific number of deaths and population affected would be necessary to calculate the mortality rate accurately.