How would I describe the rejection region of the test that h

How would I describe the rejection region of the test that has significant level of 0.05 and find the power function of the test

Let X1, X2, .., Xn be a random sample of size 20 from a Bernoulli distribution with parameter p. Inorder to test the null hypothesis H0 : p ge 1/2 versus the alternative hypothesis H1: p

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