PhysChemTutor's answer to Candice lim's Secondary 4 E Maths Singapore question.
Thanks Mr Yong.
Hi Candice, when you use 55/100 and 54/99 you are assuming that there are only 100 people in the population. In fact the population size is taken as so large that the p = .55 can be taken as constant.
Notes with thanks, Mr Yong.