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The amount of time it...

The amount of time it takes to recover physiologically from a certain kind of sudden noise is found to be normally distributed with a mean of 80 seconds and a standard deviation of 10 seconds. Using the 50%–34%–14% figures, approximately what percentage of scores (on time to recover) will be:

Above 100?

Below 100?

Above 90?

Below 90?

Above 80?

Below 80?

Above 70?

Below 70?

Above 60?

Below 60?

Above 100?

Below 100?

Above 90?

Below 90?

Above 80?

Below 80?

Above 70?

Below 70?

Above 60?

Below 60?

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