7. A study tracked a large group of people for 10 years. At the start of the study, 20% were heavysmokers (H), 30% were light smokers (L), and 50% were non-smokers (N).The interest of the study was whether the people in the study died during the study (D) or not die(Dc).The probability that a light smoker died during the study was twice that of the probability of anon-smoker dying. Also, the probability that light smoker died during the study was half that ofthe probability of a heavy smoker dying. A randomly selected person from the study died during the study. What is the probability that thisperson was a heavy smoker (given they died, what is the probability they were a heave smoker H)

step-by-step explanation:

just plug in each number for x and see which ones work and don't

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

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