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The mean time it will take for a a drive to hit the break is 1.5 seconds. 68% of drivers will be within a Standard Deviations of that value, that is 1.32 - 1.68 seconds. 95% of drivers will be within two standard deviations of that value, 1.14 - 1.86 seconds. 99.7% of drivers will be within three standard deviations of that value, 0.96 - 2.04. So what you need to do is draw a bell shaped curve and then draw an axis with 1.5 s directly under the highest point on your bell, and then the other values at appropriate distances to show the correct percentage of the area.

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16y ago
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Q: When a driver first sees danger until he gets his foot on the brake is thought to follow a normal model with a mean of 1.5 sec and SD of 0.18 sec. Use the 68-95-99.7 rule to draw the normal model.?
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