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Stats Rmsd

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Saljegi | 15:37 Sun 15th Nov 2015 | Science
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A meteorologist kept a record of the weekly rainfall in his garden for a period of 1 year.
In the first 20 weeks, the mean rainfall was 1.5cm and the rmsd was 0.1cm.
In the last 32 weeks, the mean rainfall was 1.7cm and the rmsd was 0.09cm.
What is the overall rmsd for the whole year?
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Avatar Image fiction-factory
Show us you calculations and I'll comment.
It'll be more helpful for you in the long run to have a go yourself
16:46 Sun 15th Nov 2015
Avatar Image fiction-factory
to start you off:

rmsd stands for root-mean-square deviation
and
overall mean = [(20x1.5) + (32 x1.7)] / 52

16:50 Sun 15th Nov 2015

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