This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
State Route . QQ plot for Washington State Route North Cascades Highway first opening closing dates Data are from fall through ignored the winter of when the highway did not close normal distribution would be straight line in this plot wsdot wa gov htm Own Walter Siegmund File StateRoute Probability plots Washington State