A-Level MathematicsYear 2021Q1
2 Answer ALL questions. Write your answers in the spaces provided. 1 Josh works as a proofreader at a company. He is currently correcting the errors in spelling, punctuation, and grammar in the text of a new novel. He has to make a record of every change he makes to the text. The author’s last novel had 136 pages and needed a lot of corrections. The bar chart in Figure 1 shows the distribution of text errors per page in this last novel. 0 Frequency Errors per page 60 50 40 30 20 10 0 1 2 3 4 5 6 7 Figure 1 (a) Assuming that the new novel has a similar distribution of errors to the last novel, estimate, (i) the probability that a randomly chosen page has fewer than 2 errors, (2) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ (ii) the expected number of errors per page. (3) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________
Paper Source:9ST0_01_que_20211020.pdf
Get full Socratic AI guidance on this question — free in the Applaa desktop app
Appy Buddy guides you step-by-step toward the answer without giving it away. Type your attempt and get instant, mark-scheme-aware clues that teach you to think like an examiner.
Applaa Desktop App
Join Applaa Community
Create your own games, learn AI concepts, program interactive apps, and share with a kid-safe community approved by parents. Free forever on Windows and Mac.
Download Free
Available for Windows and macOS · COPPA Compliant
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)