i just need help with questions 8 and 9 Table 3: Number and rate (per 100,000 person-years) of lung cancer deaths by number of cigarettes smoked per

i just need help with questions 8 and 9

Table 3: Number and rate (per 100,000 person-years) of lung cancer deaths by number of cigarettes smoked per day, Doll and Hill physician cohort study, Great Britain, 1951-1961.

Daily number of cigarettes smoked