Mathematics (AS & A Level) · Feb / March 2020 · Paper 62 · Question 2
9709
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Lengths of a certain species of lizard are known to be normally distributed with standard deviation 3.2 cm. A naturalist measures the lengths of a random sample of 100 lizards of this species and obtains an !% confidence interval for the population mean. He finds that the total width of this interval is 1.25 cm. Find !. [5]
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