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After Increased Patrol,cars on a Road Travel at Speeds Averaging

Question 93

Multiple Choice

After increased patrol,cars on a road travel at speeds averaging 55 km/h.If 93% of vehicles travel below 68 km/h,what approximate standard deviation could represent this model (assuming a Normal model is appropriate) ?


A) 30.41
B) 8.78
C) 63.24
D) 51.15
E) -8.78

Correct Answer:

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