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How do I do this one?
I made a probability tree diagram and added the probability of the pupils being right handed but after that I'm not quite sure what to do,any help?

 Nov 6, 2018
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Nleft=NgirlP[girls are left handed]+NboyP[boys are left handed]Nleft=3200.2+2500.1Nleft=64+25=89

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 Nov 6, 2018

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