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

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Question 5

The shelf life of a specific type of fresh bread is normally distributed.

14% of the loaves spoil in fewer than 3 days. 18% of the loaves stay fresh for longer than 7 days.

Find the mean and standard deviation of the shelf life of the bread.

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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)