The following table gives the ages of husbands and wives

Age of wives (in years) |
Age of husbands (in years) | |||

20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 | |

15 - 25 | 5 | 9 | 3 | - |

25-35 | - | 10 | 25 | 2 |

35-45 | - | 1 | 12 | 2 |

45-55 | - | - | 4 | 16 |

55-65 | - | - | - | 4 |

Find : (i) The marginal frequency distribution of the age of husbands.

(ii) The conditional frequency distribution of the age of husbands when the age of wives lies between

25 - 35.

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#### Solution

Age of wives (in years) |
Age of husbands (in years) | |||

20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 | |

15 - 25 | 5 | 9 | 3 | - |

25-35 | - | 10 | 25 | 2 |

35-45 | - | 1 | 12 | 2 |

45-55 | - | - | 4 | 16 |

55-65 | - | - | - | 4 |

Total | 5 | 20 | 44 | 24 |

Now, marginal distribution of age of husbands.

Age (years) | 20-30 | 30-40 | 40-50 | 50-60 | Total |

Number | 5 | 20 | 44 | 24 | 93 |

Now marginal distribution of husband, when the

age of wives lies between 25 – 35

Age (years) | 20-30 | 30-40 | 40-50 | 50-60 | Total |

Number | - | 10 | 25 | 2 | 37 |

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