Mathematics (AS & A Level) · May / June 2017 · Paper 73 · Question 4
9709
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Last year the mean level of a certain pollutant in a river was found to be 0.034 grams per millilitre. This year the levels of pollutant, X grams per millilitre, were measured at a random sample of 200 locations in the river. The results are summarised below. n = 200 Σx = 6.7 Σx2 = 0.2312
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4(i)[3]
4(ii)[5]
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