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The mean speed of vehicles along a stretch of highway is 56 miles per hour with...

The mean speed of vehicles along a stretch of highway is 56 miles per hour with a standard deviation of 4 miles per hour.  You measure the speeds of three cars traveling along Route 440 as 62 miles per hour, 47 miles per hour, and 56 miles per hour.  Find the Z-score that corresponds to each speed.  What can you conclude?

Math   Statistics-And-Probability   
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Answer #1

We have X : speed of vehicles has mean = 56 and standard deviation = 4

The Z score corresponding to speed X = 62 miles/hour

Z = (X - )/

Z = (62 - 56)/4

Z = 1.50

The Z score corresponding to speed X = 47 miles/hour

Z =(47-56)/4

Z = -2.25

The Z score corresponding to speed X = 56 miles /hour

Z = (56 - 56)/4

Z = 0

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