Statistical Distributions | OCR A A-Level Maths | 40 Worked Examples (H240)

A complete 40-question worked-solutions pack on Statistical Distributions for OCR A A-Level Mathematics A (H240), covering the whole of specification section 2.04: discrete probability distributions defined by a table or formula, the binomial distribution as a model (conditions, calculating probabilities, mean and variance, and the link to the binomial expansion), the normal distribution (finding probabilities, inverse-normal problems, finding an unknown mean or standard deviation from given percentiles, points of inflection at the mean plus or minus one standard deviation, and the two-thirds/95 percent shape facts), and selecting an appropriate model. Every question is graded Easy, Standard or Challenging and every solution is fully broken down: one atomic step per line, a plain-English note on every line explaining what it does, and OCR mark-scheme codes (M, A, B) folded in on the real credit-earning steps. The pack matches OCR conventions exactly: the standardisation Z transform and calculator normal functions are used throughout, the binomial formula and mean and variance are treated as provided on the exam paper, and the pack stays inside OCR scope by not asking for the mean or variance of a general discrete variable and by not calculating with the normal approximation to the binomial (only stating it and when it is reasonable). Ideal for revision, homework, or as ready-made teaching examples. 27 pages.