Are you supposed to shade histograms in 0580 math?

Also when giving answers, do I need to specify the degree of accuracy? Like for example the exam instructions say leave answers to 1dp for angles and 3sf for other values. So if I get 1.457 and js round it to 1.46, do I need to specify like this: 1.46 (3sf) It’s a stupid question but I really don’t want to lose marks over something so simple.