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(1 point) The City of Calgary reports that the number of vehicles that use the Crowchild Trail bridge various on weekdays. This variation can be modeled by the Normal distribution with a mean of 107500 vehicles and a standard deviation of 8800 vehicles per day. You pick a weekday at random and set out a traffic counter on both the north-bound and south-bound lanes of the Crowchild Trail bridge.. At the end of a 24-hour period, you are to download the data from the traffic counter and add the two figures to represent the total vehicle usage X (a) What is the probability that the total vehicle usage figure will be more than 120500 vehicles? P(X 120500) P(Z > (b) What is the probability that the total vehicle usage figure will be between 80000 and 101000? P(80000 X< 101000) (c) Find the 91 percentile. That is, 91% of the time the total number of vehicles that use the Crowchild Trail bridge in a 24-hour weekday period, is at most how many? vehicles (d) 9% of the time the total number of vehicles that use the Crowchild Trail bridge in a 24-hour weekday period, exceeds how many? vehicles

Answer 1

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