An Epidemiologic Survey of Roller-Skating Injuries in Metroville, a City

Multiple Choice

An epidemiologic survey of roller-skating injuries in Metroville, a city with a population of 100,000 (during the midpoint of the year) , produced the following data for a particular year:
Number of skaters in Metroville during any given month: 12,000
Roller-skating injuries in Metroville: 600
Total number of residents injured from roller-skating: 1800
Total number of deaths from roller-skating: 90
Total number of deaths from all causes: 900
The crude death rate for all causes was:

A) 90/600 × 100,000.
B) 900/100,000 × 100,000.
C) 90/1,800 × 100,000.
D) 90/900 × 100,000.