Question

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Answer 1

@Mertsj

Answer 2

I'm sorry, I don't know how to do that.

Answer 3

please, try to solve this iniequality:
\[2\sqrt {\frac{{p\left( {1 - p} \right)}}{N}} \leqslant \frac{8}{{100}}\]
with p=0.71

Answer 4

inequality*

Answer 5

@mathmate

Answer 6

I would also work it out the way Michele suggested.
Hint:The answer N is over 100.