Cup Size Against Milk

A café logs every milky drink it sells: the cup size and the milk. Here are Saturday morning's 20 orders, stored in a DataFrame called orders (read down the left half, then down the right):

order_id	size	milk	order_id	size	milk
101	large	oat	111	large	oat
102	small	dairy	112	medium	dairy
103	medium	oat	113	small	soy
104	large	dairy	114	large	dairy
105	large	oat	115	medium	oat
106	small	oat	116	small	dairy
107	medium	soy	117	large	oat
108	large	soy	118	medium	dairy
109	small	dairy	119	large	soy
110	medium	oat	120	small	oat

The owner suspects that people who order oat milk go large more often than people who order dairy. To check, she counts the orders in a grid, one row per size and one column per milk, and compares two shares:

What does the last line print? The code keeps full precision and rounds to 3 decimal places only at the very end, so do the same.

Cup Size Against Milk

Hints