8/13/2019 Form 4 Mathematics Chapter 6

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Chapter 6: Statistics

Frequency Table for Grouped Data:

Score Frequency Cumulative

Frequency

Lower

limit

Upper

limit

Lower

Boundary

Upper

Boundary

Midpoint

13 4 4 1 3 0.5 3.5 2

46 2 6 4 6 3.5 6.5 5

79 9 15 7 9 6.5 9.5 8

10 - 12 3 18 10 12 9.5 12.5 11

Class interval: 1-3, 4-6, 7-9, 10-12

Class size: Upper BoundaryLower Boundary

Modal class: Class interval with the highest

frequencyExample: 7-9 Mean =

( )

Histogram Frequency Polygon

Ogive

Mark the x-axis with class

boundariesMark the x-axis with midpoints

FrequencyFrequency

Mark the x-axis with

upperboundaries

Third quartile

Median

First quartile

3n/4

n/2

n/4

n

Cumulative Frequency

Form 4 Mathematics

Chapter 6: Statistics

Interquartile range= Third Quartile - First Quartile

Range

= Highest value - Smallest value

For grouped data,

Range

= Midpoint of last class - midpoint of

first class