Illustration 83. The following data show the length of life of wholesale grocers in a particul- city : Length of life (years) Percentage of wholesalers 0-5 65 5- 10 16 10– 15 15- 25 25 and over 9. 5 5 Total 100 (i) During the period studied, what is the probability that an entrant to this profession will fail within 5 years ? (ii) That he will survive at least 25 years (iii) How many years would he have to survive to be among the 10 per cent longest survivors ?

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