# NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 11 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Q. 16. A company selected 4000 households at random and surveyed them to find out a relationship between income level and the number of television sets in a home. The information so obtained is listed in the following table:

Monthly income Number of Televisions/household (in ₹) | Number of Televisions/household | |||

0 | 1 | 2 | Above 2 | |

Find the probability:

(i) Of a household earning per year and having exactly one television.

(ii) Of a household earning and more per year and owning 2 televisions.

(iii) Of a household not having any television.

Answer: (i) (ii) (iii)

Q. 17. Two dice are thrown simultaneously 500 times. Each time the sum of two numbers appearing on their tops is noted and recorded as given in the following table:

Sum | Frequency |

2 | 14 |

3 | 30 |

4 | 42 |

5 | 55 |

6 | 72 |

7 | 75 |

8 | 70 |

9 | 53 |

10 | 46 |

11 | 28 |

12 | 15 |

If the dice are thrown once more, what is the probability of getting a sum?

(i) 3?

(ii) More than 10?

(iii) Less than or equal to 5?

(iv) Between 8 and 12?

Answer: (i) (ii) (iii) (iv)