Page:Willich, A. F. M. - The Domestic Encyclopædia (Vol. 1, 1802).djvu/91

67&#93; ANN As there is allowed to be a greater disparity between births and burials in the city of London, than in my other place, Mr. Sjmb- 50W select: 1280 persons, all born in the same year, and records the number remaining alive each year, ANN [67 till none be left, in order to form a table particularly suited to this po- pulous city. The following is Mr. Simpson's table on the bills of mortality, at London : Age. Age. Persons living. Age. Persons living. A,, Persons living.

1280 24 434 48 220 72 59 1 870 25 426 49 212 73 54 2 /Of) 26 418 50 204 74 49 3 635 27 410 51 196 75 45 4 000 28 402 52 188 76 41 5 580 2.0 3.04 53 180 77 38 6 564 30 3-^5 54 172 7$ 35 7 551 31 376 55 165 79 32 8 541 32 307 56 15S 80 29 9 532 33 35S 57 151 81 26 10 524 34 349 58 144 82 23 11 51/ 35 340 59 137 S3 20 12 510 36 331 60 130 84 17 13 504 37- 322 61 123 85 14 14 408 38 313 62 117 i 86 12 15 402 39 304 63 111 87 10 16 46(5 40 204 64 105 8S 8 17 480 41 2S4 65 99 S9 6 18 47-1 42 274 66 93 90 5 19 43 264 67 87 91 4 20 462 44 255 68 81 92 3 21 455 45 246 69 7^ 93 2 22 443 46 237 70 69 04 1 23 441 47 228 71 64 95

But these tables, however pa they may be in themselves, must be oon only as probable con- jectures, founded on the usual pe- riod of human life, which is cli- mated as follows : 1. The probability that a person of a given age may live a certain number of years, is measured by the proportion which the number of persons living at the prO] age bears to the difference between the said number, and that of per- sons existing at the given ages. Thus, if it be required to know what chance a person 40 years of age may have to live seven years longer, the reader should refer to Dr. Halley's table, and from 445, the ilumher of persons living at 4Q years of age, subtract: the number of persons living at 47 years of and the remainder, being 6S, will be the number of those who have died during those seven years. The probability, that the person in ques- tion will live these seven years, is in the proportion of 3J7 to 68, or F 2 nearly