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#### Question

The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is Rs.18. Find the missing frequency *f*.

Daily pocket allowance (in Rs | 11 − 13 | 13 − 15 | 15 −17 | 17 − 19 | 19 − 21 | 21 − 23 | 23 − 25 |

Number of workers | 7 | 6 | 9 | 13 | f | 5 | 4 |

#### Solution

#### Similar questions VIEW ALL

To find out the concentration of SO_{2} in the air (in parts per million, i.e., ppm), the data was collected for 30 localities in a certain city and is presented below:

concentration of SO_{2} (in ppm) | Frequency |

0.00 − 0.04 | 4 |

0.04 − 0.08 | 9 |

0.08 − 0.12 | 9 |

0.12 − 0.16 | 2 |

0.16 − 0.20 | 4 |

0.20 − 0.24 | 2 |

Find the mean concentration of SO_{2} in the air.

The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate

Literacy rate (in %) |
45 − 55 | 55 − 65 | 65 − 75 | 75 − 85 | 85 − 95 |

Number of cities |
3 | 10 | 11 | 8 | 3 |

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’

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.

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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 |

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