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John Beale of Stanford, California, recorded the speeds of cars driving past his house, where the speed limit read 35 mph. The mean of 100 representative readings was 38.61 mph, with a standard deviation of 3.48 mph. 

Questions:
 a) How many standard deviations from the mean would a car going the speed limit be?
 b) Which would be more unusual, a car traveling 49 mph or one going 25 mph?
 c) The standard deviations for the boxes in part B are?

Solve a real-world statistics problem involving car speeds, the mean speed of 38.61 mph, and a standard deviation of 3.48 mph. Calculate the z-scores for cars traveling at 35 mph, 49 mph, and 25 mph to determine which speed is more unusual. Suitable for high school students in Grades 10-12.

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