1. [ Jan 2009 Q(2) ] Ans : (a) 0.24 (b) 0.173 (c)

.

2. [ June 2009 Q(2) ] Ans : (b)(i)

(b) (ii)

(c)

IAL and EDEXCEL Past Paper questions

S1 Probability

www.praveenglitters.tk S1/ Probability 2 of 8

3. [ Jan 2010 Q(4) ] Ans : (b)

(c)

(d)

4. [ June 2010 Q(4) ] Ans : (b) 0.46 (c) 0 (d)

(e) So yes they are statistically independent

www.praveenglitters.tk S1/ Probability 3 of 8

5. [ Jan 2010 Q(1) ] Ans : (b)

6. [ June 2010 Q(1) ] Ans : (b) 0.569 (c) 0.488 (d) 0.514

www.praveenglitters.tk S1/ Probability 4 of 8

7. [ Jan 2011 Q(5) ] Ans : (b)

(e)

(f)

www.praveenglitters.tk S1/ Probability 5 of 8

8. [June 2011 Q(6) ] Ans : (a) 0.3 (b) 0.2 (c) 0.6 (d) Not independent

(e) Not independent so confirms the teachers suspicion or they are linked.

9. [Jan 2012 Q(6) ] Ans : (b) 0.07 (c) 0.08 (e) 0.55 (f)

10. [June 2012 Q(4) ] Ans : (a) B, W or T, W Since there is no overlap between the events

www.praveenglitters.tk S1/ Probability 6 of 8

(b)

(c) 0.28 (d) 0.2 (e)

11. [June 2012 Q(7) ] Ans : (b) 0.0248 (c) 0.903 (d) 0.0745

12. [ Jan 2013 Q(7) ] Ans : (a) 0.67 (b) 0.6 (c) 0.09 (e) 0.44

www.praveenglitters.tk S1/ Probability 7 of 8

13. [ June 2013 Q(3) ] Ans : (a)

(b)

(c)

(e)

www.praveenglitters.tk S1/ Probability 8 of 8

14. [ IAL Jan 2014 Q(5) ] Ans (b) F and S or R and S (c) 0.33 (d) 0.42 (e) 0.55 (f)

15. [ IAL Jan 2014 Q(7) ] (a) 0.40 (b) 0.45 (c) 0.48 (d) 0.42