SOLUTION: A highway study of 5000 vehicles that passed by a checkpoint found that their speeds were normally distributed with a mean of 90 km/h and a standard deviation of 11km/h.
Using em
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Question 1163023: A highway study of 5000 vehicles that passed by a checkpoint found that their speeds were normally distributed with a mean of 90 km/h and a standard deviation of 11km/h.
Using empirical rule determine how many of the vehicles had a speed of more than 68km/h? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! This would be the same as asking what is the probability z > -2 since (68-90)/11=-2
That would be 0.975. Five per cent is outside +/-2 sd, and half is included in the >-2.
