exam Maths Puzzle Numerical Ability

The questions is:

There are 700 students that watch TV. 45% are men. If the confidence interval is 95% what is the true proportion of men that watch tv.

What is the correct formula?

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solve :

1)Seven inches are equivalent to 17.78 cm. Find the equation converting length in cm to length in inches. What is the length in inches of a 96.2 cm bar? {{{(1+sqrt(3))/(sqrt(3)-sqrt(2))}}} thanks for the help. Steven