add practice exam spreadsheet

diff --git a/methods/statistics.pdf b/methods/statistics.pdf
index bccb7d23b36684c039b60729dde560a93c1c6a95..27e441e8af8d9423ddf41c60a083f33fe1be90cc 100644 (file)
Binary files a/methods/statistics.pdf and b/methods/statistics.pdf differ