Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

12 questions

SA-4024-ST-0111 markL1 FoundationNon-calculatorFrequency density

A class

10<x\le25

has frequency

45

. Find its frequency density.

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SA-4024-ST4-0011 markL1 FoundationNon-calculatorFrequency density

The class

0<x\le5

has frequency

20

. Find its frequency density.

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SA-4024-ST4-0021 markL1 FoundationNon-calculatorFrequency density

The class

20<x\le40

has frequency

12

. Find its frequency density.

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SA-4024-ST4-0031 markL1 FoundationNon-calculatorFrequency density

A histogram bar for the class

10<x\le20

has frequency density

2.5

. Find the frequency.

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SA-4024-ST4-0061 markL1 FoundationCalculatorFrequency density

In a histogram, the frequency of a class is shown by

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SA-4024-ST-Q021 markL1 FoundationCalculatorFrequency density

Frequency density is

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SA-4024-ST-0102 marksL2 StandardNon-calculatorFrequency density

In a histogram, the class

30<x\le50

has a frequency density of

0.8

. Find the frequency of this class.

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SA-4024-ST4-0042 marksL2 StandardNon-calculatorUsing histograms

A histogram has bars

0<x\le10

(density

1.2

10<x\le15

(density

4

) and

15<x\le30

(density

0.8

). Find the total frequency.

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SA-4024-ST4-0073 marksL2 StandardCalculatorUsing histograms

For the histogram (

0

–

10

: frequency

12

;

10

–

15

: frequency

20

;

15

–

30

: frequency

12

), estimate the mean, to 3 significant figures.

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SA-4024-ST4-0082 marksL2 StandardNon-calculatorFrequency density

In a histogram, the class

0<x\le10

has frequency

15

and is drawn with height

1.5

. The class

10<x\le30

has frequency

20

. Find the height of its bar.

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SA-4024-ST4-0091 markL2 StandardCalculatorUsing histograms

A histogram has bars

0

–

10

(density

1.2

10

–

15

(density

4

) and

15

–

30

(density

0.8

). Which class contains the most values?

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SA-4024-ST4-0053 marksL3 ExamNon-calculatorUsing histograms

Using the same histogram (

0

–

10

: density

1.2

;

10

–

15

: density

4

;

15

–

30

: density

0.8

), estimate how many values lie between

12

and

20

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