# NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 14 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q. 5. The lengths of 62 leaves of a plant are measured in millimeters and the data is represented in the following table:

Length (in mm) | Number of leaves |

8 | |

10 | |

12 | |

17 | |

7 | |

5 | |

3 |

Draw a histogram to represent the data above.

Q. 6. The marks obtained (out of 100) by a class of 80 students are given below:

Marks | Number of students |

6 | |

17 | |

15 | |

16 | |

26 |

Construct a histogram to represent the data above.

Q. 7. Following table shows a frequency distribution for the speed of cars passing through at a particular spot on a high way:

Class interval (km/h) | Frequency |

3 | |

6 | |

25 | |

65 | |

50 | |

28 | |

14 |

Draw a histogram and frequency polygon representing the data above.

Q. 8. Refer to Q. 7: Draw the frequency polygon representing the above data without drawing the histogram.

Q. 9. Following table gives the distribution of students of sections A and B of a class according to the marks obtained by them.

Section A | Section B | ||

Marks | Frequency | Marks | Frequency |

5 | 3 | ||

12 | 16 | ||

28 | 25 | ||

30 | 27 | ||

35 | 40 | ||

13 | 10 |

Represent the marks of the students of both the sections on the same graph by two frequency polygons. What do you observe?