I was given an online assignment problem today. The answer was to be given to 2 decimal places. The answer I gave was $$P_2=0.06$$
This to me seems like 2 decimal places. However the answer was incorrect. I then wrote $$P_2=0.064$$
It was correct. I know I'm being knit-picky but I genuinely just want to know your thoughts on this.
Would you call this 3 decimal places and 2 significant figures, or 2 decimal places and 2 significant figures. In the context of the assignment it doesn't matter a whole lot but I still think he should have written 2 significant figures.
What's your 2 pence on the matter?