Mathematics (AS & A Level) · May / June 2023 · Paper 61 · Question 7

The number of accidents per week at a certain factory has a Poisson distribution. In the past the mean has been 1.9 accidents per week. Last year, the manager gave all his employees a new booklet on safety. He decides to test, at the 5% significance level, whether the mean number of accidents has been reduced. He notes the number of accidents during 4 randomly chosen weeks this year.

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