Probability | GCSE Maths Grade 4 Walkthrough

Probability step by step - estimating how many times something happens, finding a missing probability when they all add up to one, sharing what is left equally, twice as much or in a ratio, working back from a count to the total, and deciding whose results to trust. All 20 questions on the GCSE Grade 4 Probability worksheet, worked through step by step. 📄 Download the free worksheet (exam style, answers included): https://effectiveeducation.online/wor... ✏️ Then practise with GCSE-style questions that mark your answers instantly: https://effectiveeducation.online In this video: • Estimates: the probability times the number of tries • Probabilities add up to 1 - finding the missing one • Sharing what is left: equally, twice as many, in a ratio, 0.1 more • Working back from a count to the total • Whose estimate is better, and pooling everyone's results • Exam-style problems with coins, marbles and pens Chapters: 0:00 Q1 Fair coin, estimate the heads 0:17 Q2 Biased coin, estimate the heads 0:40 Q3 The missing probability 1:17 Q4 Biased spinner, estimate 1:49 Q5 Estimate from a fraction 2:11 Q6 Two equal missing probabilities 2:54 Q7 Twice as many 3:46 Q8 Missing probabilities in a ratio 4:38 Q9 One is 0.1 more than the other 5:29 Q10 Biased dice, estimate for 2 or 4 6:36 Q11 Total from a count 7:08 Q12 Count of another colour 7:53 Q13 Probability from twice and three times 8:29 Q14 Survey estimate for a school 9:01 Q15 Whose estimate is better, then pooled 9:49 Q16 Equal probabilities, then an estimate 10:58 Q17 Coins of equal value 11:40 Q18 Total, then a ratio 12:31 Q19 Twice as many, then a count 13:32 Q20 Pens added, new probability #GCSEMaths #Probability #MathsRevision