Notes 4bii ft from their tree diagram. Allow one error for M1. Can also be found from Pearson Progression Step Q Scheme Marks AOs and Progress descriptor 5a 2nd Tree (both sections) and labels Draw and use simple tree 0.85, 0.15 diagrams with 0.03, 0.97, 0.06, 0.94 two branches and two levels. B1 3.1a B1 1.1b B1 1.1b (3) 5b P(Not faulty) = (0.85 × 0.97) + (0.15 × 0.94) M1 3.4 2nd 1.1b Draw and use M1dep simple tree A1 = 0.9655 1.1b diagrams with two branches and two levels. (3) (6 marks) Notes 5b M1 for either 0.85 × 0.97 or 0.15 × 0.94 (ft from their tree diagram) and M1 (dep) for adding two such probabilities (allow one error).
Notes 4bii ft from their tree diagram. Allow one error for M1. Can also be found from Q Scheme Marks AOs Pearson Progression Step and Progress descriptor 5a Tree (both sections) and labels 0.85, 0.15 0.03, 0.97, 0.06, 0.94 B1 B1 B1 3.1a 1.1b 1.1b 2nd Draw and use simple tree diagrams with two branches and two levels. (3) 5b P(Not faulty) = (0.85 × 0.97) + (0.15 × 0.94) = 0.9655 M1 M1dep A1 3.4 1.1b 1.1b 2nd Draw and use simple tree diagrams with two branches and two levels. (3) (6 marks) Notes 5b M1 for either 0.85 × 0.97 or 0.15 × 0.94 (ft from their tree diagram) and M1 (dep) for adding two such probabilities (allow one error).
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