[chem] start practical investigation notes

diff --git a/methods/statistics.pdf b/methods/statistics.pdf
index 8fb6a8999330440b7042bd61bb14ed80cbdaaec6..0929ba09c6bc5f4402728543f81cac3f1a88f066 100644 (file)
Binary files a/methods/statistics.pdf and b/methods/statistics.pdf differ