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2.4.6 Probabilities using the normal distribution (A-level only)

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Question 19

Scores on a professional certification exam are modeled by a normal distribution.

15% of candidates score lower than 60 marks. 10% of candidates score higher than 85 marks.

Calculate the mean and standard deviation of the scores.

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2.4.6 Probabilities using the normal distribution (A-level only) Questions

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