The Student Room Group

Stuck? Help please

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 :smile:
Reply 1
yh yh divide by 2^2 init logic bro

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