Three valid records
Made-up practice story.
Made-up liquid-loss records over matched intervals are P5,Q0,R10 mL, with S blank and T marked spill. Organise the valid values.
Make something useful
Use a small caption, arrow model, table or spoken explanation for this exact question. Keep the supplied story beside you.
Grown-up help
Worked practice: Table or equal-scale columns show P5,Q0,R10 mL. Q is a supplied zero; S is missing; T is invalid for the comparison. Keep the labels for S/T visible outside the plotted values.
Complete Day 37 plan. This is ordinary practice, not a held assessment source.