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James ruse 2023?View attachment 39888
for part (ii) in the ans they take P(X<9) but shouldn't it be P(X<8) cause thats less than 9 and cause its discrete you can have 8.5 ppl?
Yea lolJames ruse 2023?
The question says to use a normal approximation to solve it as the sample size is sufficiently large enough for it to be reasonable. The normal approximation is continuous btw
No, just do what the question tells you to. If it asks for smaller than 9, do <9, not <= 8. You can do continuity correction if you want but it seems it’s not necessary for hsc.Yea lol
Ohh right okay but if it was say binomial probabilty with like np and nq< 10 then you would do P(x≤8) right?
As a straight binomial probability,No, just do what the question tells you to. If it asks for smaller than 9, do <9, not <= 8. You can do continuity correction if you want but it seems it’s not necessary for hsc.