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Assume that the size of the urinary bladder for men is normally distributed with a mean of 550 ml and a standard deviation of 100 ml.

How big proportion of men in the population have a urinary bladder bigger than 650 ml?

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    How big? I'm guessing those men might be slightly bigger than average. Seriously though you should give some idea of your attempts on, and understanding of, this homework-style question. – 2017-02-16

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In normal distribution about $68.2\%$ of population lies within interval $(m-\sigma, m+\sigma)$. The other part lies outside this interval placed 50-50 on both sides of the interval.

Therefore there is about $\frac{1-.682}{2}\cdot 100\% = 15.9\%$ of population satisfying your condition.