A-Level MathematicsYear 2020Q4
19 Turn over Question 4 continued Donal obtained records for the number of legal cases resolved by the end of the month for each of the 90 agents in his sample. These are shown in Figure 6. Number of resolved cases Frequency Probability x 11 9 0.071 12 x 14 26 0.246 15 x 17 36 18 x 20 17 x 21 2 Total 90 Figure 6 (f) Use a χ2 goodness-of-fit test to investigate whether Donal’s records imply that the model B(40, 0.4) is indeed appropriate for the number of legal cases resolved by an agent by the end of the month. You may use the empty columns in Figure 6 for your working, if you require them. (10) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________
Paper Source:9ST0_03_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)