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Four quarters are tossed one-hundred times and the number of tails that come up with each...

Four quarters are tossed one-hundred times and the number of tails that come up with each toss are recorded. The following results were obtained: zero tails one tail two tails three tails four tails 10 15 40 20 15 Test the null hypothesis with a 10% significance level that the coins are fair.

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