Pearson Edexcel Level 3 GCE Statistics Advanced PAPER 1: Data and Probability. question booklet and mark scheme results 2022

Pearson Edexcel Level 3 GCE Statistics Advanced PAPER 1: Data and Probability. question booklet and mark scheme results 2022 provided. 1 Josh works as a proofreader at a company. He is currently correcting the errors i ...

Pearson Edexcel Level 3 GCE Statistics Advanced PAPER 1: Data and Probability. question booklet and mark scheme results 2022 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) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Question 1 continued _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ The new novel has 223 pages. (b) Assuming that the new novel has a similar distribution of errors to the last novel, estimate the expected number of errors in the new novel. (1) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ (c) Give one reason why the assumption used in (a) and (b) may be valid. (1) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ (d) Give one reason why the assumption used in (a) and (b) may not be valid. (1) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ (Total for Question 1 is 8 marks