A driver's reaction time in response to another car changinglanes is normally distributed with a mean of 0.4 seconds and astandard deviation of 0.05 seconds.

1- What is the probability it takes a driver longer than 0.5seconds to react???

2-We design braking systems to be safer by building to thereasonably slowest person. What reaction time will 99.99% of thedrivers be faster than???

3- 80% of the driver reaction times will be slower than whatreaction time???