The amount of time it takes to recover physiologcally 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 score (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%
