OFFICIAL SUMMER 2025 PEARSON EDEXCEL Pearson Edexcel GCE In Statistics (9ST0) Paper 03: Statistics in Practice MERGED QUESTION PAPER + MARK SCHEME

OFFICIAL SUMMER 2025 PEARSON EDEXCEL Pearson Edexcel GCE In Statistics (9ST0) Paper 03: Statistics in Practice MERGED QUESTION PAPER + MARK SCHEME Answer ALL questions. Write your answers in the spaces provided. 1 A study in 2021 investigated the number of hail days in a large European area covering Germany, France, Belgium and Luxembourg. A hail day was defined as one in which a radar detected the conditions necessary for hail to occur anywhere within this area. Over the past 20 years, the mean number of hail days in a year in this area was 86 [Source : (a) Find the probability that (i) in a randomly chosen year there would be at least 90 hail days, (ii) in a randomly chosen two‑year period, there are no more than 160 hail days. (b) State two assumptions needed, in the context of this question, to calculate the probabilities in (a) and in each case give a reason why that assumption may not be appropriate. (2) (2) (4