A-LevelMathematicsProbability and statisticsMay/June 2023Paper 5 Q512 Marks
The lengths of Western bluebirds are normally distributed with mean 16.5cm and standard deviation 0.6 cm. A random sample of 150 of these birds is selected. The lengths of Eastern bluebirds are normally distributed with mean 18.4cm and standard deviation σcm. It is known that 72% of Eastern bluebirds have length greater than 17.1 cm. A random sample of 120 Eastern bluebirds is chosen.
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