Cumulative frequency/box plots (OCR GCSE Maths): Quizzes

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Cumulative frequency/box plots
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What is cumulative frequency?

A running total of frequencies

What does the word 'cumulative' mean?

Adding up

What should the last entry in a cumulative frequency column equal?

The total frequency

What is another name for a cumulative frequency curve?

An ogive

What should be plotted on the xx-axis when drawing a cumulative frequency curve?

The upper boundary of each group

Where should a cumulative frequency curve start?

At (0,0)(0, 0)

The median is at which percentile?

50th percentile

The lower quartile (Q1Q1) is at which percentile?

25th percentile

The upper quartile (Q3Q3) is at which percentile?

75th percentile

How is the interquartile range (IQRIQR) calculated?

Q3Q1Q3 - Q1

What percentage of the data does the IQRIQR measure the spread of?

The middle 50%

Why is the IQRIQR a useful measure of spread?

It is not affected by outliers

What five values make up the five-number summary for a box plot?

Min, Q1Q1, median, Q3Q3, max

In a box plot, what do the whiskers extend to?

The minimum and maximum values

In a box plot, what does the box extend between?

Q1Q1 and Q3Q3

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