Hi Could someone tell me what the step is from the first equation to the second equation in the examiners report please when trying to get ZB>ZA? How did they get from n/(n+391) > sqrt(n)/40 to sqrt(n)/(n+391) > 1/40? Where did the sqrt(n) come from in sqrt(n)/(n+391) > 1/40? Thanks
Thanks for your reply - Why can we not just do n/(n+391) > 1/40, why do you need to divide both sides by sqrt(n)?
Hi Barns Just basic algebra? Maybe you've not realised that sqrt(n)*sqrt(n)=n. Note your formula in your second post is different from that in your first post. Ian