2025 Pearson Edexcel A Level (GCE) Statistics Statistics in Practice Paper 3

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Centre Number Candidate Number




Pearson Edexcel Level 3 GCE
Tuesday 17 June 2025
Afternoon (Time : 2 hours) Paper
reference 9ST0/03
Statistics
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Advanced
PAPER 3 : Statistics in Practice


You must have : Total Marks
Statistical formulae and tables booklet
Calculator


Candidates may use any calculator allowed by Pearson regulations.
Calculators must not have retrievable mathematical formulae stored in them.
Instructions
•• Use black ink or ball‑point pen.

• Fill
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
in the boxes at the top of this page with your name,

• Answer
centre number and candidate number.
all questions and ensure that your answers to parts of questions are

• Answer
clearly labelled.
the questions in the spaces provided

• You
– there may be more space than you need.
should show sufficient working to make your methods clear.

•• Unless
Answers without working may not gain full credit.
otherwise stated, inexact answers should be given to three significant figures.
Unless otherwise stated, statistical tests should be carried out at the
5% significance level.
Information
•• AThere
booklet ‘Statistical formulae and tables’ is provided.

• – use this asfora guide
are 6 questions in this question paper. The total mark for this paper is 80.
The marks each question are shown in brackets
as to how much time to spend on each question.
Advice
•• Read each question carefully before you start to answer it.

•• Check
Try to answer every question.
your answers if you have time at the end.
If you change your mind about an answer, cross it out and put your new answer
and any working underneath. Turn over


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2

, 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
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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 : www.doi.org/10.5194/nhess‑21‑683‑2021]

(a) Find the probability that
(i) in a randomly chosen year there would be at least 90 hail days,
(2)
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(ii) in a randomly chosen two-year period, there are no more than 160 hail days.
(2)
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(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.
(4)
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(Total for Question 1 is 8 marks)




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