AnSWErS to tHE StudEnt'S Book ExErCiSES - Hodder Plus Home

5 a)First toss Second tossThird tossOutcomeProbability1212HT121212HTH121212121212HTHTHTHHHHHTHTHHTTTHHTHT1212 12121212181 81 1 1 1222 81 1 1 1222 81 1 1 1222 81 1 1 1222 8b) (i)1_81122HT(ii)3_8Exercise 42.3 (page 571)1 a)First ball12T(iii)4_8 5 1_2Second ballTTHTTTOutcome1 1 1 1222 81 1 1 1222 8Probability610YellowYY71161042110711Yellow410RedYR71141028110411Red710YellowRY4117102811042b) (i) ___110 5 __ 2155992 a) ___24953 a)First game310(ii)b)Red___ 56110 5 __ 2855___ 8992495Second gameRROutcome41131012110Probability0.7Judith winsJJ0.7 0.7 0.49Judith wins0.70.3Suki winsJS0.7 0.3 0.210.3Suki wins0.5Judith winsSJ0.3 0.5 0.15Mixed exercise 42 (page 573)1 a) 0.85 b) 0.40172 a) __b) __ 155 3_2525 53 a) 0.5 b) 0.914 a) __ b) __ 4c)252515 a) __42 b) __ 642 5 1_16 ___2160.57 c) 30Suki winsb) (i) 0.49 (ii) 0.15 (iii) 0.364 a) 0.42 b) 0.3412 1445 a) ____24 360 5 ____ 506 b) ____ 12 216101524 360 5 ____ 50910152160c) ____ ___24 360 5 18203__ 625__42 5 5_7SS0.3 0.5 0.15240Answers to the Student’s Book exercisesHigher WJEC GCSE Mathematics © 2010, Hodder Education