Use first_cdf instead of cdf for first-born percentile rank

AllenDowney / ThinkStats2

Text and supporting code for Think Stats, 2nd Edition

http://allendowney.github.io/ThinkStats2/

GNU General Public License v3.0

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Closed fsimkovic closed 6 years ago

fsimkovic commented 6 years ago

It appears that the incorrect cdf was chosen for the first dataset.

AllenDowney commented 6 years ago

Thank you!