Frequency table or grouped data (Edexcel GCSE Statistics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is essential to include when working with frequency tables?
What is essential to include when working with frequency tables?
Values and frequencies
What is the purpose of multiplying frequency by (x - x̄)²?
What is the purpose of multiplying frequency by (x - x̄)²?
To account for variability
What is the main difference when calculating standard deviation with frequency data?
What is the main difference when calculating standard deviation with frequency data?
Weighting each value by frequency
How does standard deviation relate to data spread?
How does standard deviation relate to data spread?
It measures variability or spread
What should students do to avoid common mistakes in standard deviation?
What should students do to avoid common mistakes in standard deviation?
Double-check calculations and setup
Using Σf(x−x̄)² = 24 and Σf = 25, find standard deviation (to 2 d.p.).
Using Σf(x−x̄)² = 24 and Σf = 25, find standard deviation (to 2 d.p.).
0.98
Using computational formula with Σfx²=105, Σfx=45, Σf=25; find standard deviation.
Using computational formula with Σfx²=105, Σfx=45, Σf=25; find standard deviation.
0.98
Find the mean from Σfx = 45 and Σf = 25.
Find the mean from Σfx = 45 and Σf = 25.
1.8
If x = 2 occurs f = 9 times in a table, what is fx?
If x = 2 occurs f = 9 times in a table, what is fx?
18
Given x={0,1,2,3,4} with f={2,8,9,5,1} (n=25), find the sd to 2 d.p.
Given x={0,1,2,3,4} with f={2,8,9,5,1} (n=25), find the sd to 2 d.p.
0.98