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Data Handling

    Introduction

    Organisation of Data

    Representative Values

    Arithmetic Mean

    Mode

    Median

    Presentation of data

    Exercise 7.1

    Exercise 7.2

    Exercise 7.3

    Exercise 7.4

    Extra Curriculum Support

    Looking Back

    Easy Level Worksheet Questions

    Moderate Level Worksheet Questions

    Hard Level Worksheet Questions

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Glossary

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Data Handling > Looking Back

Looking Back

(1) Mean, mode and median are representative values for a set.

(2) Arithmetic mean (or) mean is equal to of all the observations of a data set by the number of observations. It lies the lowest and highest values of the data.

(3) An observation of data that occurs frequently is called the mode of the data. A data set may have one or more modes and sometimes none.

(4) Median is simply the observation, when all observations are arranged in order. (In case of even number of observations the median is the average of middle two observations.)

(5) A pie chart is a circular chart/graph divided into , and is used to present data.

(6) The central angle of each sector (and consequently its area) in a pie chart, is to the quantity that it represents.