i) Among 4020 male participants the lifetime prevalence of low back pain was shown to be 32 %. Calculate the number of m

[answerhappygod]

i) Among 4020 male participants the lifetime prevalence of low
back pain was shown to be 32 %. Calculate the number of males
participants reported to have had low back pain during their
adolescent years. Show your working. (1 mark)
ii) Among 21- to 22-year-old males 197 out of 420 reported to
have had lifetime low back pain. 658 of the 1302 adolescent males
in the younger age group never experienced low back pain. Is there
a risk of developing lifetime low back pain when youths get older?
Justify your answer. Show all working. (2 mark)