#### The water bills (in rupees) of 32 houses in a locality are given below:

30, 48, 52, 78, 103, 85, 37, 94, 72, 73, 66, 52, 92, 65, 78, 81, 64, 60, 75, 78, 108, 63, 71, 54, 59, 75, 100, 103, 35, 89, 95, 73.

Taking class intervals 30-40, 40-50, 50-60, ….. , form frequency distribution table. Construct a combined histogram and frequency polygon.

**Solution:**

Class Intervals | Tally Marks | Frequency |

30-40 | III | 3 |

40-50 | I | 1 |

50-60 | IIII | 4 |

60-70 | 5 | |

70-80 | 9 | |

80-90 | III | 3 |

90-100 | III | 3 |

100-110 | IIII | 4 |

Take class intervals on x-axis and frequency on y-axis:

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