Sum

If the Crude Death Rate (CDR) for the following data is 13.4 per thousand, find x:

Age groups (in years) |
Population | Number of deaths |

0 - 20 | 40,000 | 350 |

20 - 65 | 65,000 | 650 |

65 and above | 15,000 | x |

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#### Solution

Age groups (in years) |
Population | Number of deaths |

0 - 20 | 40,000 | 350 |

20 - 65 | 65,000 | 650 |

65 and above | 15,000 | x |

Total | ΣP = 1,20,000 | ΣD = x + 1000 |

CDR = 13.4

`therefore (Σ"D")/(Σ"P") xx 1000` = 13.4

`(x + 1000)/120000 xx 1000` = 13.4

x + 1000 = 13.4 x 120

x + 1000 = 1608

`therefore` x = 608

Concept: Commission, Brokerage and Discount

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