Histograms with unequal class widths (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 the formula for calculating frequency density?
What is the formula for calculating frequency density?
Frequency ÷ class width
How do you find class width for a data interval?
How do you find class width for a data interval?
Upper boundary - lower boundary
Using a class width of 10 and a frequency of 30, what is the frequency density?
Using a class width of 10 and a frequency of 30, what is the frequency density?
3
What must you do after calculating frequency density for each class?
What must you do after calculating frequency density for each class?
Use them to draw bars
What is the main purpose of using frequency density instead of frequency in such histograms?
What is the main purpose of using frequency density instead of frequency in such histograms?
To adjust for class width differences
When drawing the histogram, what should the y-axis be labeled?
When drawing the histogram, what should the y-axis be labeled?
Frequency density
What mathematical reason justifies using frequency density?
What mathematical reason justifies using frequency density?
To ensure bar area = frequency
If class width is 15 and the frequency is 45, what is the frequency density?
If class width is 15 and the frequency is 45, what is the frequency density?
3
What is a key point when creating histograms with unequal class intervals?
What is a key point when creating histograms with unequal class intervals?
Use frequency density to scale bars
Using the worked example, what is the frequency density for 20 ≤ t < 40?
Using the worked example, what is the frequency density for 20 ≤ t < 40?
0.6