plumiTests on variances: Edexcel A‑Level Further Maths questions
Edexcel A-Level Further Maths past-paper questions on 7.4 Tests on variances, 2018–2025, with mark schemes and examiner’s reports where available. Add MadAsMaths questions to your practice, or browse them separately by topic and difficulty.
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All 8 questions on Tests on variances, as a list
- June 2025, Further Statistics 2, Q3 (6 marks): A scientist investigated the effects of nitrogen-fixing bacteria on cereal crop yield, x kg ha –1 The data come from independent random samples from normal dist
- June 2025, Further Statistics 2, Q4 (13 marks): The weights of apples Sam grows are normally distributed with a mean of 131 g and a standard deviation of 6 g A supermarket will only buy apples with weights in
- June 2024, Further Statistics 2, Q3 (8 marks): A factory produces bolts. The lengths of the bolts are normally distributed with mean μ mm and standard deviation 0.868 mm A random sample of 15 of these bolts
- June 2023, Further Statistics 2, Q3 (8 marks): Two machines, A and B, are used to fill bottles of water. The amount of water dispensed by each machine is normally distributed. Samples are taken from each mac
- June 2022, Further Statistics 2, Q5 (8 marks): The concentration of an air pollutant is measured in micrograms/m3 Samples of air were taken at two different sites and the concentration of this particular air
- November 2021, Further Statistics 2, Q6 (15 marks): Elsa is collecting information on the wingspan of two different species of butterfly, Ringlet and Meadow Brown. She takes a random sample of each type of butter
- November 2020, Further Statistics 2, Q1 (6 marks): 1 Gina receives a large number of packages from two companies, A and B. She believes that the variance of the weights of packages from company A is greater than
- June 2019, Further Statistics 2, Q3 (8 marks): 3 Yin grows two varieties of potato, plant A and plant B. A random sample of each variety of potato is taken and the yield, x kg, produced by each plant is meas
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