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A-Level MathematicsYear 2020Q2

4 2 Jemima makes jam to sell in a local shop. The jam is sold in jars and the weight of jam in a jar is normally distributed. Jemima takes a random sample of 8 of her jars of jam and weighs the contents of each jar, x grams. Her results are summarised as follows ∑ x = 3552 ∑ x2 = 1 577 314 (a) Calculate a 95% confidence interval for the mean weight of jam in a jar. (5) The labels on the jars state that the average contents weigh 440 grams. (b) State, giving a reason, whether or not Jemima should be concerned about the labels on her jars of jam. (1) ___________________________________________ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___________________________________________

Paper Source:9FM0_4B_que_20201024.pdf

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Exam Specification Info

This question is part of the UK A-Level Mathematics syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.

Syllabus levelAdvanced Level (A-Level)

SubjectMathematics

Official MarksVariable (2–6 marks)

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