Question

part 2 of 2
find the approximate values that corresponds to the given percentiles by constructing a percentile graph. round your answers to the nearest whole number.

percentiles speeds (mph)
8th

Explanation:

Step1: Identify the percentile and graph

We need to find the speed (mph) corresponding to the 8th percentile using the percentile graph (ogive). The x - axis is class boundaries (related to speed), and the y - axis is the percentile (cumulative percentage).

Step2: Locate the 8th percentile on y - axis

Find the value 8 on the y - axis (percentile). Then, draw a horizontal line from 8 until it intersects the ogive curve.

Step3: Draw vertical line to x - axis

From the intersection point, draw a vertical line down to the x - axis (class boundaries, which represent speed). The x - axis value at this intersection (after rounding to the nearest whole number) is the speed corresponding to the 8th percentile. Looking at the graph, when the percentile is 8, the corresponding class boundary (speed) is around 387 (after rounding, since the class boundary near the 8th percentile's intersection is close to 386.5, which rounds to 387).

Answer:

387