OCR A LEVEL MATHEMATICS, MATHS B (MEI) PAPER 2 H640/02: MARK SCHEME JUNE 2022; PURE MATHS AND STATISTICS. Y is the number of 12s obtained in 30 rolls; 0.16 – 0.163 BC A1 1.1 allow B2 for 0.1628 – 0.163 unsupported [2] 12 (a) H0 : μ = 1.5 H1 : μ < 1.5 B1 1.1 both hypotheses in terms of μ μ is the population mean weight of flour in a bag B1 2.5 allow μ is the population mean weight of a bag of flour [2] Question Answer Marks AO Guidance 12 (b) N (