Hypothesis test on a binomial distribution

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Given that I am working on a binomial distribution $\operatorname{Bin}(10,p)$ and I am trying to construct a hypothesis test for $p$. $H_0=0.5$ vs $H_1=0.55$. Assume that we want a significance level 0.05. How can I decide what is the value for $c$, the critical value? Also, Why can't we get a significance level of exactly 0.05?

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Significance is calculated based on the null distribution. Just find the closest thing you can get to upper and lower 2.5th percentiles given $p=0.5$. You won't get this exactly because the Binomial distribution is defined on the integers.