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Stuck? Help please

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    The first bit I kinda understand, but not fully, however the calculation part I cannot understand why it is divided in half twice? I got to the 0.21 answer by dividing my initial answer by two, but I'm unsure as to why they divided by two again? And the final bit I am completely stumped on.

    Thanks, help is appreciated
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    yh yh divide by 2^2 init logic bro
 
 
 
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