times for an ambulance to respond to a medical emergency in a certain town are normally distributed with a mean of 450 seconds and a standard deviation of 50 seconds. There were 97 emergencies in the town
in about how many emergencies would response times be between 400- 500 seconds?
One standard deviation above and below the mean encompasses 68%
68% x 97=~~66
When I was in school, we were taught to remember the standard bell curve values like the one below: