Скачать или смотреть Measures of Location and Spread (Q2 A2 P3 Edexcel 2025)

In this A-Level Statistics 2025 Paper 3 (Edexcel) walkthrough, Lee Guffick works through Question 2 on measures of location and spread — explaining how to calculate the mean and standard deviation from summary statistics, and how to compare two data sets to interpret real-world context.
Lee shows you how to:


Use Σx and Σx² values to calculate the mean and standard deviation.


Apply the formula s=Σx2n−xˉ2s = \sqrt{\frac{\Sigma x^2}{n} - \bar{x}^2}s=nΣx2​−xˉ2​.


Interpret and compare the results for Coach A and Coach B using the mean and standard deviation.


Explain which coach is more likely to have trained the winner — linking statistical measures to real performance outcomes.


This question is a classic example of data comparison and interpretation, helping you understand both location (mean) and spread (standard deviation) — key for the Edexcel A-Level Statistics paper.
⏱️ TIMESTAMPS:
00:00 Introduction to the question
00:20 Calculating the mean for Coach A
00:45 Calculating the standard deviation for Coach A
01:40 Interpreting Coach A’s results (mean = 55.15s, s.d. = 2.2s)
02:10 Comparing with Coach B (mean = 55.1s, s.d. = 3.6s)
02:40 Explaining which coach is more likely to train the winner
03:20 Visualising the comparison using distribution shapes
04:00 Summary and key takeaway
✏️ TOPICS COVERED:


Mean and standard deviation from summary statistics


Comparing two data sets


Interpreting measures of spread and consistency


Normal distribution and variability


Real-world interpretation of data


💯 EXAM TIPS:


Always write out the formula before substituting values — easy marks for method.


Watch units (seconds vs. m/s) and round to 2 d.p. where appropriate.


When comparing data, link both mean and standard deviation to the context (e.g., consistency vs. best performance).


A smaller standard deviation = more consistent results; larger = greater variation and potential for extremes.


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