**CONTENT: i) The Pictogram**

** ii) The bar charts**

** iii) The pie charts**

**INTRODUCTION**

A frequency table is a numerical presentation of data in an organized summary from.

Diagrams, symbols and pictures sometimes catch the eye more quickly than the number.

They also tell stories more easily than numbers. It is also observed that it is easier to understand frequency table than the raw data, another method of presenting data, which most graphical find easier than table, is observe method. Graphs help us to observe any patterns easily. Examples of these graphs are pictogram, bar chart, line graph and pie chart.

**THE PICTOGRAM**

This uses pictures to represent statistics information or data. The pictogram is also called an ideograph. A pictogram uses pictures or drawings to give a quick and easy meaning to statistical data. A pictogram is a simple way of representing data in which a number of indentical drawings or pictures and used to show the data. It is useful to use pictures which can easily be divided into halves, quarters and do on. A pictogram must have a key to show that each picture stands for. Also you need to give the diagram a title

**Example: **The following table shows the favorite sports of 75 students

Represent the data in the form of a pictogram.

__Favourite sports Frequency__

Football 25

Wrestling 10

Boxing 5

Table Tennis 15

Swimming 20

**Evaluation Question**

The following table shows the number of students in JSS 1 in different houses at a certain school.

Represent the data in the form of a pictogram

House | Blue | Yellow | Green | Purple |

Students | 16 | 14 | 11 | 21 |

**Reading Assignment**

- Essential mathematics for JSS 1 by AJS Oluwasanmi page 262-273
- New general mathematics for JSS 1 by AJS Channon other. Page 145-151
- MAN mathematics for JSS 1 page 211

**THE BAR CHARTS**

Bar chart is very like a pictogram. The bars have the same width and usually have equal spaces between them. Instead of using pictures as in case of the pictogram, we must use a bar to represent the frequency of each of the item. In drawing a bar chart, we must take the following features into consideration.

- The charts consists of bars
- The bars must be of equal width
- The lengths of the bars are in proportion of the frequencies being represented. The bars may be vertical or horizontal

**Example**

The following figures show the number of children per family in a sample of 40 households

1, 2, 4, 3, 4, 3, 8, 3, 2, 2, 3, 2, 5, 6,

5, 4, 2, 1, 3, 2, 4, 5, 3, 8, 7, 6, 5,

4, 5, 7, 6, 3, 8, 6, 3, 5, 7, 5, 4, 3

**Solution**

- Frequency table

No of children per family | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |

frequency | 2 | 5 | 9 | 7 | 7 | 4 | 3 | 3 |

**THEORY**

- 40 youths who were admitted into a mental hospital due to drug abuse were asked to name the types of drugs they often take. The table shows how they replied.

Indian hemp 35%

Morphine 20%

Heroine 15%

Cocaine 30%

- Represent this information in a pie chart

Find the number of youths in each category

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