Mathematics (AS & A Level) · Oct / Nov 2020 · Paper 62 · Question 7

Before a certain type of book is published it is checked for errors, which are then corrected. For costing purposes each error is classified as either minor or major. The numbers of minor and major errors in a book are modelled by the independent distributions N380, 140 and N210, 80 respectively. You should assume that no continuity corrections are needed when using these models. A book of this type is chosen at random.

Read automatically from the paper; the printed page above is exact.