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

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Question 22

The annual rainfall in a specific region is normally distributed with a mean of 850 mm. Records show that in 20% of years, the rainfall is more than 1000 mm.

Find the standard deviation of the annual rainfall.

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

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  3. /2.4.6 Probabilities using the normal distribution (A-level only)