What was the standardized mortality ratio (SMR) for lung diseases in miners?

 

What was the standardized mortality ratio (SMR) for lung diseases in miners?

 

In 1990, there were 6,000 deaths due to lung diseases in miners aged 20 to 64 years. The expected number of deaths in this occupational group, based on age-specific death rates from lung diseases in all males aged 20 to 64 years, was 2,600 during 1990.
a. What was the standardized mortality ratio (SMR) for lung diseases in miners? [ONE POINT]

b. Interpret the value of the SMR: [ONE POINT]