Class 12 Probability · Short Answer2 Marksindependence
Class 12 Maths · Probability · Short Answer #48
Students A,B arrive on time independently with probabilities 2/7 and 4/7. Find P(exactly one is on time).
✅ Step-by-Step Solution
Final Answer: 26/49
- The disjoint cases are A on time and B late, or A late and B on time.
- P=(2/7)(3/7)+(5/7)(4/7)=6/49+20/49.
- Thus P=26/49.
📋 CBSE Stepwise Marking Scheme
- [0.5 marks] The disjoint cases are A on time and B late, or A late and B on time.
- [1 mark] P=(2/7)(3/7)+(5/7)(4/7)=6/49+20/49.
- [0.5 marks] Thus P=26/49.
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