What is the cutoff number of heads above which you reject the null hypothesis at the

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What is the cutoff number of heads above which you reject the null hypothesis at the α = 0.1 significance level?
A coin is flipped 10 times and comes up heads 9 times. You have reason to suspect however, that the coin produces an excess of heads (and have told this to a friend in advance), as in Exercise 7.
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