The weights of bags of sugar are normally distributed with a mean of 505 g and 12% of the bags have a weight of less than 498 g.
Find the standard deviation of the weights of the bags of sugar.
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Markscheme
3.5 Finding the mean and standard deviation Questions
48 exam-style questions on Edexcel A Level Maths 3.5 Finding the mean and standard deviation. Each one has a worked solution and a mark scheme showing where the marks go.