The following table gives distribution of total population and those who ar- wholly or partly blind among them. Find out if there is any relation between age and blindness. Age No. of persons (in thousands) 010 1020 2030 3040 4050 5060 6070 7080 100 60 40 36 24 11 6. 3 Blind 55 40 40 40 36 22 18 15

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