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#### Question

A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.

Number of days | 0 − 6 | 6 − 10 | 10 − 14 | 14 − 20 | 20 − 28 | 28 − 38 | 38 − 40 |

Number of students | 11 | 10 | 7 | 4 | 4 | 3 | 1 |

#### Solution

#### Similar questions

The measurements (in mm) of the diameters of the head of the screws are given below:

Diameter (in mm) | No. of Screws |

33 — 35 | 10 |

36 — 38 | 19 |

39 — 41 | 23 |

42 — 44 | 21 |

45 — 47 | 27 |

Calculate mean diameter of head of a screw by ‘Assumed Mean Method’.

Consider the following distribution of daily wages of 50 worker of a factory.

| 100 − 120 | 120 − 140 | 140 −1 60 | 160 − 180 | 180 − 200 |

| 12 | 14 | 8 | 6 | 10 |

Find the mean daily wages of the workers of the factory by using an appropriate method.

The table below shows the daily expenditure on food of 25 households in a locality.

Daily expenditure (in Rs) | 100 − 150 | 150 − 200 | 200 − 250 | 250 − 300 | 300 − 350 |

Number of households | 4 | 5 | 12 | 2 | 2 |

Find the mean daily expenditure on food by a suitable method.

In a retail market, fruit vendors were selling mangoes kept in packing boxes. These boxes contained varying number of mangoes. The following was the distribution of mangoes according to the number of boxes.

Number of mangoe | 50 − 52 | 53 − 55 | 56 − 58 | 59 − 61 | 62 − 64 |

Number of boxes | 15 | 110 | 135 | 115 | 25 |

Find the mean number of mangoes kept in a packing box. Which method of finding the mean did you choose?

The following table gives the frequency distribution of trees planted by different Housing Societies in a particular locality:

No. of Trees | No. of Housing Societies |

10-15 | 2 |

15-20 | 7 |

20-25 | 9 |

25-30 | 8 |

30-35 | 6 |

35-40 | 4 |

Find the mean number of trees planted by Housing Societies by using ‘Assumed Means Method’