The proportional mortality ratio (%) due to roller-skating was:

Understand the Problem

The question is asking for the calculation of the proportional mortality ratio due to roller-skating using given data. It provides specific figures about deaths and injuries related to roller-skating, which must be plugged into one of the provided formulas to find the percentage.

Answer

The proportional mortality ratio due to roller-skating is $10\%$.

Steps to Solve

Identify the Proportional Mortality Ratio Formula

The proportional mortality ratio (PMR) can be calculated using the formula:

$$ \text{PMR} = \left( \frac{\text{Deaths from specific cause}}{\text{Total deaths}} \right) \times 100 $$

Plug in the Values for the Specific Cause

For roller-skating, we have:

Deaths from roller-skating = 90
Total deaths from all causes = 900

We'll use these values in the formula:

$$ \text{PMR} = \left( \frac{90}{900} \right) \times 100 $$

Calculate the Proportional Mortality Ratio

Now, perform the division and multiply by 100:

$$ \frac{90}{900} = 0.1 $$

Then, multiply by 100 to get the percentage:

$$ 0.1 \times 100 = 10 $$

The proportional mortality ratio (%) due to roller-skating is $10%$.

More Information

The proportional mortality ratio reflects the percentage of deaths from a specific cause compared to total deaths. In this case, 10% of deaths in Metroville were due to roller-skating, which can indicate the level of risk associated with that activity compared to other factors.

Tips

Confusing the numbers: Make sure to always use "deaths from the specific cause" as the numerator and "total deaths" as the denominator.
Forgetting to multiply by 100 to convert to a percentage.

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