Higher November 2019 Paper 3 Q11
11 The probability tree diagram shows the probabilities that Bismah will be late for work on two days next week.
Calculate the probability that Bismah will be late on exactly one of the two days. (3)
| Answer | Mark | Mark scheme |
|---|---|---|
| 0.1709 | M1 | for one product, \(0.07 \times 0.98\ (= 0.0686)\) or \(0.93 \times 0.11\ (= 0.1023)\) or \(0.07 \times 0.02\ (= 0.0014)\) or \(0.93 \times 0.89\ (= 0.8277)\) |
| M1 | for a fully correct method, eg \(0.07 \times 0.98 + 0.93 \times 0.11\) or \(1 - (0.07 \times 0.02) - (0.93 \times 0.89)\) | |
| A1 | oe |
Additional guidance
If all products shown, award this mark