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Here we have represented the groups of observations (i.e., class intervals). We draw two perpendicular axes and choose a suitable scale for each axes. We mark class intervals on the horizontal axis and the respective class frequencies on the vertical axis. The height of the bars show the number of data items in a particular group and is the frequency of the class-interval.

Sometimes, jagged line or broken line has been used along the horizontal line to indicate that we can not show all the numbers after zero to the 1st class of the given data.

The graphical representation of data in this manner is called a histograph.

Class Interval |
Frequency |

0 - 10 |
2 |

10 - 20 |
10 |

20 - 30 |
21 |

30 - 40 |
19 |

40 - 50 |
7 |

50 - 60 |
1 |

Total |
60 |

From the above graph we can say that,

the group 20 - 30 has the maximum number of students.

The group 50 - 60 has the minimum number of students.

The group 30 - 40 contains 19 number of students. The number of students who got marks between 40 to 50 are 7.

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