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Repeated tests on the determination of human blood composition during a laboratory analysis are known to be normally distributed. Ten tests on a given sample of blood yielded the values are as follows:
1.002, 0.958, 1.014, 1.009, 1.041, 1.058, 1.024, 1.019, 1.020
Find a 99 per cent confidence interval for true composition of the blood in repeated tests of the sample.