# NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 8 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Exercise 14.3**

Q. 1. The blood groups of 30 students are recorded as follows: A, B, O, A, AB, O, A, O, B, A, O, B, A, AB, B, A, AB, B, A, A, O, A, AB, B, A, O, B, A, B, A Prepare a frequency distribution table for the data.

Answer:

Blood Group | Number of Students (frequency) |

A | 12 |

B | 8 |

AB | 4 |

O | 6 |

Total | 30 |

Q. 2. The value of π upto 35 decimal places is given below: Make a frequency distribution of the digits 0 to 9 after the decimal point.

Answer:

Digit | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |

Frequency | 1 | 2 | 5 | 6 | 3 | 4 | 3 | 2 | 5 | 4 |

Q. 3. The scores (out of 100) obtained by 33 students in a mathematics test are as follows:

Represent this data in the form of a frequency distribution.

Answer:

Scores | 48 | 58 | 64 | 66 | 69 | 71 | 73 | 81 | 83 | 84 |

Frequency | 3 | 3 | 4 | 7 | 6 | 3 | 2 | 1 | 2 | 2 |

Q. 4. Prepare a continuous grouped frequency distribution from the following data:

Mid-point | Frequency |

5 | 4 |

15 | 8 |

25 | 13 |

35 | 12 |

45 | 6 |

Answer:

Class | |||||

Frequency |

Class size = 10