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2.4.12 Calculate probabilities from a Normal distribution (A-level only)

2.4.12 Calculate probabilities from a Normal distribution (A-level only)

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Question 105

The mass of a high-precision turbine blade, M M\,M grams, is modeled by a normal distribution with a mean of 450.5 g and a standard deviation of 1.8 g. A quality control engineer selects a random sample of 20 blades from a large production batch. Determine the probability that the mean mass of these 20 blades, Mˉ\bar{M}Mˉ, is greater than 451.2 g.

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Markscheme

2.4.12 Calculate probabilities from a Normal distribution (A-level only) Questions

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  3. /2.4.12 Calculate probabilities from a Normal distribution (A-level only)

149 exam-style questions on OCR (MEI) A Level Maths 2.4.12 Calculate probabilities from a Normal distribution (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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