Asked by Steve

Hello i am doing assignment in my math 20-2 class. The question is: data collected of cars passing on the road revealed that the average speed was 90 km/h with a standard deviation of 5 km/h and the data which is normally distributed a policeman is assigned to set photo radar on the road in which the posted speed limit is 80 km/h it's 600 cars pass the photo radar in the police man sets the camera so that only those exceeding the speed limit by 10% are photographed, then how many drivers can the police expect to ticket? Can someone please tell me how to solve this?
Answered by PsyDAG
Z = (score-mean)/SD

If the camera is set at 10% above speed limit = 88 km/h.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability in the larger portion related to the Z score. Multiply by 600.

Answered by Steve
Ok but before we start we usually write downwhat the mean equals, standard deviation and X. Im still confused on which one would be the mean.
Answered by Steve
I found that the inversenorm is 83.5922, what do i do after this?
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