A-LevelMathematicsProbability and statisticsOct/Nov 2023Paper 6 Q712 Marks
A biologist wishes to test whether the mean concentration μ, in suitable units, of a certain pollutant in a river is below the permitted level of 0.5. She measures the concentration, x, of the pollutant at 50 randomly chosen locations in the river. The results are summarised below. n = 50, Σx = 23.0, Σx² = 13.02
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