Speeds for same stretch of roadways


Give a normal distribution data of 46.0 with a standard devation of 3.0.

What is the 85th percentile?

What is the upper two standard deviation speed?

The daily average speeds for same stretch of roadways on consecutive normal days were determined by sampling 25 cars each day. What us the upper two standard deviation upper deviation speed?

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Basic Statistics: Speeds for same stretch of roadways
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